“ROCK UNIT”, “UNIT NAME”, “AGE”, “DESCRIPTION”, “FOSSIL”, “RADIOMETRIC AGE”, “SOURCE”, “CLASS”, “QUADRANGLE”, “ROCK CLASS”, “NSACLASS”, “LABEL”, “NSAMOD”, “QCLASS” JQu,"Glacial deposits and volcanic and plutonic rocks, undivided","Quaternary, Tertiary to Jurrassic","Glacial deposits and volcanic and plutonic rocks, undivided",,,KN007,705,Kenai,Igneous,99,,,99 bu,Possible bedrock of unknown character,Unknown,"Areas that air photo interpretation suggest as being underlain by bedrock. Typically are of higher elevation than surrounding glacial deposits and show hints of structure. In one case, an apparent strike and dip of bedding is perceptible on air photos.",,,KN008,899,Kenai,Sedimentary,99,,,99 bu,"Bedrock, undivided","Quaternary, Tertiary to Jurrassic","Bedrock, undivided",,,KN007,99,Kenai,,99,,,99 Qs,Surficial deposits,Holocene and Pleistocene,Surficial deposits,,,SV002,82,Seldovia,Unconsolidated,100,,,1000 Qs,Surficial deposits,Holocene and Pleistocene,Surficial deposits,,,KN002,100,Kenai,Unconsolidated,100,,,1000 Qs,Surficial deposits,Holocene and Pleistocene,Surficial deposits,,,KN003,3100,Kenai,Unconsolidated,100,,,1000 Qs,Unconsolidated surficial deposits,Holocene,"Undifferentiated boulders, cobbles, gravel, sand, silt, and clay of present streams; angular clasts of talus and locally, landslide deposits; stratified sand, silt, and clay of alluvial fan and flood-plain deposits; well-sorted stratified sand and gravel of glaciofluvial origin, including deltaic deposits; unsorted material of morainal deposits; glaical-lake silt, clay, and muskeg deposits; and locally interstratified beach gravel, sand, and clay; Unconsolidated surficial deposits",,,BS004,3,Blying Sound,Unconsolidated,100,,,1000 Qs,Unconsolidated surficial deposits,Holocene,"Undifferentiated boulders, cobbles, gravel, sand, silt, and clay of present streams; angular clasts of talus and locally, landslide deposits; stratified sand, silt, and clay of alluvial fan and flood-plain deposits; well-sorted stratified sand and gravel of glaciofluvial origin, including deltaic deposits; unsorted material of morainal deposits; glaical-lake silt, clay, and muskeg deposits; and locally interstratified beach gravel, sand, and clay; Unconsolidated surficial deposits",,,SR004,3,Seward,Unconsolidated,100,,,1000 Qu,"Surficial deposits, undivided",Holocene,"Predominantly alluvium deposited by nonglacial streams and outwash deposited by glacial meltwater. Consists of sand and gravel; terminal, lateral, and ground moraine composed of unsorted deposits of boulders, cobbles, gravel, and sand left by the retreat of alpine, valley, and regional glaciers; and talus and landslide deposits from adjacent bedrock. Also includes less extensive deposits consisting mostly of sand that may be locally abundant and form such features as beaches, spits, offshore bars in coastal areas, and dunes on the Copper River delta. Surficial deposits, undivided",,,BS002,100,Blying Sound,Unconsolidated,100,,,1000 Qu,"Surficial deposits, undivided",Holocene,"Predominantly alluvium deposited by nonglacial streams and outwash deposited by glacial meltwater. Consists of sand and gravel; terminal, lateral, and ground moraine composed of unsorted deposits of boulders, cobbles, gravel, and sand left by the retreat of alpine, valley, and regional glaciers; and talus and landslide deposits from adjacent bedrock. Also includes less extensive deposits consisting mostly of sand that may be locally abundant and form such features as beaches, spits, offshore bars in coastal areas, and dunes on the Copper River delta. Surficial deposits, undivided",,,MI002,100,Middleton Island,Unconsolidated,100,,,1000 Qu,"Surficial deposits, undivided",Holocene,"Predominantly alluvium deposited by nonglacial streams and outwash deposited by glacial meltwater. Consists of sand and gravel; terminal, lateral, and ground moraine composed of unsorted deposits of boulders, cobbles, gravel, and sand left by the retreat of alpine, valley, and regional glaciers; and talus and landslide deposits from adjacent bedrock. Also includes less extensive deposits consisting mostly of sand that may be locally abundant and form such features as beaches, spits, offshore bars in coastal areas, and dunes on the Copper River delta. Surficial deposits, undivided",,,SR002,100,Seward,Unconsolidated,100,,,1000 none,Drift River delta,"Quaternary, Holocene","Drift river delta, no description",,,KN007,707,Kenai,Unconsolidated,100,,,1000 Qs,Quaternary surficial deposits,Quaternary,Undivided surficial deposits,,,KN009,900,Kenai,Unconsolidated,100,,,1000 Qs,"Surficial deposits, undifferentiated",Holocene,"Surficial deposits, undifferentiated -- Alluvium deposited by nonglacial streams and outwash deposited by glacial meltwater.",,,CV003,110,Cordova,Unconsolidated,100,,,1000 Qu,"Surficial deposits, undivided",Holocene,"Predominantly alluvium deposited by nonglacial streams and outwash deposited by glacial meltwater. Consists of sand and gravel; terminal, lateral, and ground moraine composed of unsorted deposits of boulders, cobbles, gravel, and sand left by the retreat of alpine, valley, and regional glaciers; and talus and landslide deposits from adjacent bedrock. Also includes less extensive deposits consisting mostly of sand that may be locally abundant and form such features as beaches, spits, offshore bars in coastal areas, and dunes on the Copper River delta. Surficial deposits, undivided",,,CV002,100,Cordova,Unconsolidated,100,,,1000 yellow,Recent glacio-fluvial deposits,"Quaternary, Holocene",glacio-fluvial deposits,,,CV005,502,Cordova,Unconsolidated,100,,,1000 yellow,Recent glacio-fluvial deposits,"Quaternary, Holocene",Glacio-fluvial deposits,,,CV006,502,Cordova,Unconsolidated,100,,,1000 Qs,Undifferentiated surficial deposits,Quaternary,"Mainly unsorted gravel, sand, and silt produced, deposited, and reworked by action of wind, water, glaciers, and frost, including solifluction. In many areas of the map, this unit is a mixture of surrounding surficial deposit units that could not be readily sub-divided. In the vicinity of the Drift River delta, this unit contains a significant proportion of volcanic debris derived from airfall, mudflows and lahars from Mt. Redoubt",,,KN008,800,Kenai,Unconsolidated,100,,,1000 Qcaf,"Colluvium, alluvium, lacustrine, and floodplain deposits","Quaternary, Holocene","Colluvium, alluvium, lacustrine, and floodplain deposits",,,SV005,1500,Seldovia,Unconsolidated,100,,,1000 Qcaf,"Colluvium, alluvium, lacustrine, and floodplain deposits","Quaternary, Holocene","Colluvium, alluvium, lacustrine, and floodplain deposits",,,KN011,1100,Kenai,Unconsolidated,100,,,1000 Qs,Quaternary,Quaternary,Unconsolidated deposits,,,KN012,1201,Kenai,Unconsolidated,100,,,1000 Q,"Surficial deposits, undivided",Holocene,"Predominantly glacial moraine and outwash deposits and beach and terrace deposits. Consists of sand and gravel; terminal, lateral, moraine composed of unsorted deposits of boulders, cobbles, gravel, and sand left by retreat of alpine and valley glaciers; and talus consisting of coarse angular rock debris derived from bedrock",,,SR005,3007,Seward,Unconsolidated,100,,,1000 Qag,Unconsolidated deposits,Quaternary,"Includes stream and beach deposits, glacial till and outwash gravels, colluvium, and landslide debris",,,KN014,141,Kenai,Unconsolidated,100,,,1000 Qaf,"Floodplains and alluvial fans, Alluvial fans and alluvial fan complexes","Quaternary, Pleistocene","Alluvial fans and alluvial fan complexes. Southernmost polygons recoded as Quaternary deposits, undivided.",,,SV007,4141,Seldovia,Unconsolidated,100,,,1000 Qtf,Modern tidal flat and estuarine deposits,Quaternary,"Well-sorted, stratified silt and some sand and local gravel deposited in shallow embayments. Sub-tidal.",,,KN008,803,Kenai,Unconsolidated,103,,,1030 Qas,Tidal silt and beach deposits,"Quaternary, Holocene",Tidal silt and beach deposits,,,KN013,401,Kenai,Unconsolidated,103,,,1030 Qas,Tidal silt and beach deposits,"Quaternary, Holocene",Tidal silt and beach deposits,,,SV007,401,Seldovia,Unconsolidated,103,,,1030 Qal,Alluvial deposits -- Floodplain deposits,Quaternary,"Floodplain deposits, inferred to be largely moderately to well-sorted sand and gravel. Some silt locally.",,,KN006,607,Kenai,Unconsolidated,105,,,1050 Qal,"Alluvial deposits, Flood-plain alluvium","Quaternary, Recent","Flood-plain alluvium, poorly- to well-sorted silt, sand, pebbles, cobbles, and boulders. Mainly cobbles and boudlers except near tidewater. Includes some glacial outwash.",,,KN005,500,Kenai,Unconsolidated,105,,,1050 Qs,Stream-channel deposits,Quaternary,Stream channel deposits,,,KN007,701,Kenai,Unconsolidated,105,,,1050 Qal,Alluvium,Quaternary,"Mainly gravel and coarse sand, consists in part of glacial and glaciofluvial material reworked by postglacial streams. Forms flood plains along major streams and rivers.",,,KN008,805,Kenai,Unconsolidated,105,,,1050 Qal,"Alluvial deposits, Flood-plain alluvium","Quaternary, Recent","Flood-plain alluvium, poorly- to well-sorted silt, sand, pebbles, cobbles, and boulders. Mainly cobbles and boudlers except near tidewater. Includes some glacial outwash.",,,SV004,500,Seldovia,Unconsolidated,105,,,1050 Qa,Alluvium ,Holocene,In active streambeds and lowest terraces along larger streams and active alluvial fans. Chiefly well sorted gravel and sand; minor silt and boulders,,,CV004,703,Cordova,Unconsolidated,105,,,1050 Qft,Floodplains and alluvial fans,"Quaternary, Pleistocene",Flood plains and associated higher terraces along major streams and abandoned drainage lines,,,KN013,413,Kenai,Unconsolidated,105,,,1050 Qft,Floodplains and alluvial fans,"Quaternary, Pleistocene",Flood plains and associated higher terraces along major streams and abandoned drainage lines,,,SV007,413,Seldovia,Unconsolidated,105,,,1050 Qaf,Floodplains and alluvial fans,"Quaternary, Pleistocene",Alluvial fans and alluvial fan complexes. Northern polygons in Kenai quadrangle recoded as alluvium.,,,KN013,4140,Kenai,Unconsolidated,105,,,1050 Qaf,Alluvial deposits -- Alluvial fans,Quaternary,"Deposits of large flat alluvial fans, inferred to be moderately sorted sand and gravel",,,KN006,608,Kenai,Unconsolidated,106,,,1060 Qcf,Alluvial deposits -- Small alluvial-colluvial fans,Quaternary,"Dposits of small, steep alluvial-colluvial fans, inferred to be non-sorted silt, sand, and gravel",,,KN006,609,Kenai,Unconsolidated,106,,,1060 Qf,"Alluvial deposits, Alluvial fans and cones","Quaternary, Recent","Alluvial fans and cones, unsorted rock talus, in part colluvial in origin.",,,KN005,501,Kenai,Unconsolidated,106,,,1060 Qfs,"Alluvial deposits, Partially submerged alluvial fans and cones","Quaternary, Recent",Partially submerged alluvial fans consisting of sand and gravel; exposed at low tide,,,KN005,502,Kenai,Unconsolidated,106,,,1063 Qcf?,Alluvial deposits -- Small alluvial-colluvial fans,Quaternary,"Dposits of small, steep alluvial-colluvial fans, inferred to be non-sorted silt, sand, and gravel",,,KN006,630,Kenai,Unconsolidated,106,,,1060 Qf,Fan deposits,Quaternary,Alluvial fan deposits of Cresecent River,,,KN007,702,Kenai,Unconsolidated,106,,,1060 Qaf,Alluvial fan deposits,Quaternary,"Gravel, silt, and sand, commonly occur at mouth of small side canyons. Includes some colluvial deposits.",,,KN008,806,Kenai,Unconsolidated,106,,,1060 Qf,"Alluvial deposits, Alluvial fans and cones","Quaternary, Recent","Alluvial fans and cones, unsorted rock talus, in part colluvial in origin.",,,SV004,501,Seldovia,Unconsolidated,106,,,1060 Qaf,"Floodplains and alluvial fans, Alluvial fans and alluvial fan complexes","Quaternary, Pleistocene",Alluvial fans and alluvial fan complexes,,,KN013,414,Kenai,Unconsolidated,106,,,1060 Qaf,"Floodplains and alluvial fans, Alluvial fans and alluvial fan complexes","Quaternary, Pleistocene",Alluvial fans and alluvial fan complexes,,,SV007,414,Seldovia,Unconsolidated,106,,,1060 Qct,Deposits of Mass Wasting -- talus,Quaternary,Cone-shaped deposits of talus beneath steep bedrock slopes,,,KN006,610,Kenai,Unconsolidated,107,,,1071 Qpr,Deposits of Mass Wasting -- protalus ramparts,Quaternary,Deposits of protalus ramparts,,,KN006,613,Kenai,Unconsolidated,107,,,1071 Qlc,Landslide and colluvial deposits,Quaternary,Unsorted deposits of fine to coarse rubble,,,KN005,510,Kenai,Unconsolidated,107,,,1070 Qt,Talus,"Quaternary, Holocene","Talus-- Boulder- to pebble-sized, angular rock debris.",,,CV003,140,Cordova,Unconsolidated,107,,,1071 tan,Talus,"Quaternary, Holocene",Talus,,,CV005,503,Cordova,Unconsolidated,107,,,1071 tan,Talus,"Quaternary, Holocene",Talus,,,CV006,503,Cordova,Unconsolidated,107,,,1071 Qc,Colluvial deposits,"Quaternary, Holocene","Chiefly rubble, gravel, sand, silt, and clay. Talus and other slope debris deposits, also includes alluvium of minor streams, and locally glacial, rock glacier, and mass-wasting deposits. May include older glacial drift and locally grades into glacial deposits.",,,KN008,807,Kenai,Unconsolidated,107,,,1070 Qlc,Landslide and colluvial deposits,Quaternary,Unsorted deposits of fine to coarse rubble,,,SV004,510,Seldovia,Unconsolidated,107,,,1070 Qu,"Slope deposits, undifferentiated","Quaternary, Holocene and Pleistocene","Colluvium consisting of talus and small landslides, also includes small glacial, rock glacier, and alluvial deposits. Sand, gravel, boulders, diamicton, and rubble",,,CV004,701,Cordova,Unconsolidated,107,,,1070 Qls,Deposits of Mass Wasting -- landslide deposits,Quaternary,"Deposits of landslides, including falls, slumps, slides, and failures by lateral spreading. Assigned NSA = 312 in vicinity of Polly Creek where this unit consists of debris flows from Mount Redoubt.",,,KN006,611,Kenai,Unconsolidated,108,,,1080 Qcm,Deposits of Mass Wasting -- mudflow and debris-flow deposits,Quaternary,"Mudflow and debris flow deposits, may include some volcanic mudflow (lahar) deposits",,,KN006,612,Kenai,Unconsolidated,108,,,1081 Qls?,Deposits of Mass Wasting -- landslide deposits,Quaternary,"Deposits of landslides, including falls, slumps, slides, and failures by lateral spreading",,,KN006,626,Kenai,Unconsolidated,108,,,1080 Qcm?,Deposits of Mass Wasting -- mudflow and debris-flow deposits,Quaternary,"Mudflow and debris flow deposits, may include some volcanic mudflow (lahar) deposits",,,KN006,631,Kenai,Unconsolidated,108,,,1081 Qls,Landslides,"Quaternary, Holocene","Landslides-- Unsorted, angular rock debris derived by failure of bedrock slopes.",,,CV003,145,Cordova,Unconsolidated,108,,,1080 Qls,Landslide deposits,Quaternary,"Chiefly rubble, gravel, sand, silt, and clay. Most extensive in Jurassic sedimentary rock northeast of Mount Iliamna",,,KN008,808,Kenai,Unconsolidated,108,,,1080 Qra,Rock avalanche deposits,"Quaternary, Holocene",Rock avalanche deposits,,,SV005,1508,Seldovia,Unconsolidated,108,,,1080 Ql,Landslide deposits,"Quaternary, Holocene and Pleistocene","Slumps, earth-debris flows, block glides, and debris avalanches. Diamicton and rubble",,,CV004,713,Cordova,Unconsolidated,108,,,1080 Qls,Landslide,Quaternary,Landslide debris near Bluff Point,,,KN014,142,Kenai,Unconsolidated,108,,,1080 Qao,Older alluvium,Quaternary,Older alluvial deposits found in larger stream valleys at levels higher than modern alluvium. Grades into terrace deposits,,,KN008,809,Kenai,Unconsolidated,109,,,1090 Qao,Older alluvium,"Quaternary, Holocene and Pleistocene","In higher terraces along larger streams and in inactive alluvial fans. Predominantly of Pleistocene age, but may include localized Holocene deposits. Chiefly well sorted gravel and sand; minor silt and boulders",,,CV004,705,Cordova,Unconsolidated,109,,,1090 Qtg,Terrace deposits,Quaternary,Terrace gravels in outwash above modern floodplains. Air photo interpretation,,,KN008,810,Kenai,Unconsolidated,110,,,1100 Symbol,Abandoned or underfit stream channel,Quaternary?,"Abandoned or underfit stream channel, inferred to be relict glacial meltwater channel. Shown by symbol on map",,,KN006,623,Kenai,Unconsolidated,111,,,1110 Qac,Abandoned channel deposits,Quaternary,Abandoned channel deposits in outwash above modern floodplains. Air photo interpretation,,,KN008,811,Kenai,Unconsolidated,111,,,1110 lt green,Recent Lacustrine deposits,"Quaternary, Holocene",Lacustrine deposits,,,CV005,501,Cordova,Unconsolidated,112,,,1120 lt green,Recent Lacustrine deposits,"Quaternary, Holocene",Lacustrine deposits,,,CV006,501,Cordova,Unconsolidated,112,,,1120 Qfl,Fine-grained deposits,"Quaternary, Holocene","In ponds, swamps, lagoons, and along low-gradient streams. Chiefly silt, clay, fine sand, peat, and other organic material",,,CV004,707,Cordova,Unconsolidated,112,,,1120 Qm,Other unconsolidated deposits -- swamp and muskeg,Quaternary,"Swamp and muskeg deposits, mainly organic material, but may include clay, silt, or sand",,,KN006,614,Kenai,Unconsolidated,113,,,1130 Qsw,Swamp deposits,Quaternary,"Silt, sandy silt, and bog deposits, interpreted from air photos",,,KN008,813,Kenai,Unconsolidated,113,,,1130 Qlv,Natural levee deposits,Quaternary,Natural levee deposits on deltaic or fan delta deposits. ,,,KN008,814,Kenai,Unconsolidated,114,,,1140 Qb,Beach deposits,"Quaternary, Holocene","Sand, gravel, and cobbles of present and former beaches, beach ridges, spits, and tidal flats",,,BS004,1,Blying Sound,Unconsolidated,115,,,1150 Qb,Beach deposits,"Quaternary, Holocene","Sand, gravel, and cobbles of present and former beaches, beach ridges, spits, and tidal flats",,,SR004,1,Seward,Unconsolidated,115,,,1150 Qbv,Other unconsolidated deposits -- vegetated beach deposits,"Quaternary, Holocene",Vegetated beach deposits consisting mainly of mixed sand and gravel,,,KN006,616,Kenai,Unconsolidated,115,,,1151 Qbn,Other unconsolidated deposits -- nonvegetated beach deposits,"Quaternary, Holocene",Nonvegetated beach deposits consisting mainly of mixed sand and gravel,,,KN006,617,Kenai,Unconsolidated,115,,,1150 Qbe,"Beach deposits, Elevated beach ridges","Quaternary, Recent","Elevated beach ridges, well-sorted well-stratified, well-drained sand and gravel",,,KN005,503,Kenai,Unconsolidated,115,,,1151 Qbv?,Other unconsolidated deposits -- vegetated beach deposits,"Quaternary, Holocene",Vegetated beach deposits consisting mainly of mixed sand and gravel,,,KN006,629,Kenai,Unconsolidated,115,,,1151 Qb,"Beaches, spits, and offshore bars","Quaternary, Holocene","Beaches, spits, and offshore bars -- Constructional shoreline deposits of well-sorted gravel and sand.",,,CV003,115,Cordova,Unconsolidated,115,,,1150 Qbe,"Beach deposits, Elevated beach ridges","Quaternary, Recent","Elevated beach ridges, well-sorted well-stratified, well-drained sand and gravel",,,SV004,503,Seldovia,Unconsolidated,115,,,1150 Qb,Beach deposits,"Quaternary, Holocene and Pleistocene",Moderately well-stratified and sorted sand and gravel on beaches,,,KN008,815,Kenai,Unconsolidated,115,,,1150 Qb,Beach and delta deposits ,"Quaternary, Holocene","Wave-deposited, coarse-grained material and driftwood along seacoast; fine-grained sediment in mud flats of Copper River Delta; and marine uplift terraces. Successive spit-building episodes of progressive gradation are preserved in beach sequences along coastal lowland between Cape Yakataga and Bering Glacier. Boulders, gravel, sand, and silt",,,CV004,703,Cordova,Unconsolidated,115,,,1150 Qb,Beach and delta deposits ,"Quaternary, Holocene","Wave-deposited, coarse-grained material and driftwood along seacoast; fine-grained sediment in mud flats of Copper River Delta; and marine uplift terraces. Successive spit-building episodes of progressive gradation are preserved in beach sequences along coastal lowland between Cape Yakataga and Bering Glacier. Boulders, gravel, sand, and silt",,,CV004,709,Cordova,Unconsolidated,115,,,1150 Qifv,Other unconsolidated deposits -- vegetated tidal marsh deposits,"Quaternary, Holocene","Vegetated tidal marsh deposits, consist of organic material mixed with sand and gravel",,,KN006,618,Kenai,Unconsolidated,116,,,1160 Qifn,Other unconsolidated deposits -- nonvegetated tidal marsh deposits,"Quaternary, Holocene","Nonvegetated tidal marsh deposits, consist of organic material mixed with sand and gravel",,,KN006,619,Kenai,Unconsolidated,116,,,1160 Qida,Other unconsolidated deposits -- delta deposits,"Quaternary, Holocene","Delta deposits, representing the intertidal parts of fans and contain coarser material than adjacent tidal flats",,,KN006,620,Kenai,Unconsolidated,116,,,1160 Qbm,"Beach deposits, Salt marsh","Quaternary, Recent","Salt- marsh, well-stratified silt and small pebbles, poorly drained",,,KN005,504,Kenai,Unconsolidated,116,,,1160 Ql,Lagoonal deposits,"Quaternary, Holocene","Lagoonal deposits--Fine-grained silt rich in organic material, mud, and peat.",,,CV003,120,Cordova,Unconsolidated,116,,,1160 Qes,Estuarine deposits,Quaternary,"Well-sorted, stratified silt and some sand deposited in shallow embayments, supra-tidal, hence probably uplifted",,,KN008,816,Kenai,Unconsolidated,116,,,1160 Qbm,"Beach deposits, Salt marsh","Quaternary, Recent","Salt- marsh, well-stratified silt and small pebbles, poorly drained",,,SV004,504,Seldovia,Unconsolidated,116,,,1160 Qts,Elevated tidal silt and beach deposits,"Quaternary, Pleistocene",Elevated tidal silt and beach deposits. Record high sea level stand about 10 - 15 feet above present datum during late Tanya time,,,KN013,415,Kenai,Unconsolidated,116,,,1160 Qts,Elevated tidal silt and beach deposits,"Quaternary, Pleistocene",Elevated tidal silt and beach deposits. Record high sea level stand about 10 - 15 feet above present datum during late Tanya time,,,SV007,415,Seldovia,Unconsolidated,116,,,1160 Qtm,Marine terrace deposits,"Quaternary, Pleistocene and Holocene",Marine terrace deposits,,,KN008,817,Kenai,Unconsolidated,117,,,1170 Qad,Cliff-head dune sand,"Quaternary, Holocene","Cliff-head dune sand. Near Point Possession; of ""Alaskan"" age",,,KN013,402,Kenai,Unconsolidated,119,,,1190 Qd,Dunes,"Quaternary, Holocene","Dunes-- Well sorted, fine grained sand and silt aligned in longitudinal ridges.",,,CV003,125,Cordova,Unconsolidated,120,,,1200 Qe,Eolian deposits ,"Quaternary, Holocene","Dunes on tops of river bluffs, windblown flats, and river bars. Includes informally named Bremner sand dunes, a large barchan field, located at confluence of Bremner and Copper Rivers. Fine-grained sand",,,CV004,715,Cordova,Unconsolidated,120,,,1200 Qld,Hanging delta deposits of Naptowne age,"Quaternary, Pleistocene",Hanging deltaic complexes associated with one or more strandline levels and deposited at mouth of streams draining into proglacial lakes of Naptowne age,,,KN013,410,Kenai,Unconsolidated,123,,,1230 Qds,Glacial deposits -- Proglacial stratified drift,Quaternary,Includes stratified and locally foreset-bedded sand and gravel that occur below 125 m elevation on West Foreland and from Katchin Creek to Redoubt Point; these deposits are probable emerged delta and glaciolacustrine deposits. Also includes active outwash fans,,,KN006,603,Kenai,Unconsolidated,124,,,1240 Qds?,Glacial deposits -- Proglacial stratified drift,Quaternary,Includes stratified and locally foreset-bedded sand and gravel that occur below 125 m elevation on West Foreland and from Katchin Creek to Redoubt Point; these deposits are probable emerged delta and glaciolacustrine deposits. Also includes active outwash fans,,,KN006,632,Kenai,Unconsolidated,124,,,1240 Qglf,Glaciolacustrine deposits,Quaternary,"Ephemeral glacial lake deposits. Well-sorted, well-stratified clay, silt, and fine sand deposited in ephemeral glacial and postglacial lakes. Thought to be typically covered by several feet of muck and peat",,,KN008,824,Kenai,Unconsolidated,124,,,1240 Qlb,Proglacial lake bottom sediments of Naptowne age,"Quaternary, Pleistocene",Proglacial lake bottom sediments underlying terraced and channeled surfaces between major morainal belts in lowland and mountain valleys,,,KN013,409,Kenai,Unconsolidated,124,,,1240 Qlb,Proglacial lake bottom sediments of Naptowne age,"Quaternary, Pleistocene",Proglacial lake bottom sediments underlying terraced and channeled surfaces between major morainal belts in lowland and mountain valleys,,,SV007,409,Seldovia,Unconsolidated,124,,,1240 Qm,Moraine,Quaternary,Morainal deposits,,,KN003,125,Kenai,Unconsolidated,125,,,1250 Qd,Glacial deposits -- Undifferentiated glacial drift,Quaternary,"Inferred to consist of lodgement till, ablation till, and stratified drift. Thickness ranges widely.",,,KN006,600,Kenai,Unconsolidated,125,,,1250 Qdt,Glacial deposits -- Lateral or terminal moraines,Quaternary,Till deposits in the form of lateral or terminal moraines,,,KN006,601,Kenai,Unconsolidated,125,,,1250 Qdi,Glacial deposits -- Stratified drift,Quaternary,Stratified drift in ice-contact deposits (kame terraces or deltas). Identified by high local relief and steeply sloping margins.,,,KN006,602,Kenai,Unconsolidated,125,,,1250 Qd?,Glacial deposits -- Undifferentiated glacial drift,Quaternary,"Inferred to consist of lodgement till, ablation till, and stratified drift. Thickness ranges widely.",,,KN006,625,Kenai,Unconsolidated,125,,,1250 Qdt?,Glacial deposits -- Lateral or terminal moraines,Quaternary,Till deposits in the form of lateral or terminal moraines,,,KN006,624,Kenai,Unconsolidated,125,,,1250 Qdi?,Glacial deposits -- Stratified drift,Quaternary,Stratified drift in ice-contact deposits (kame terraces or deltas). Identified by high local relief and steeply sloping margins.,,,KN006,627,Kenai,Unconsolidated,125,,,1250 lime,Older glacial deposits,"Quaternary, Holocene and Pleistocene",Glacial deposits,,,CV006,511,Cordova,Unconsolidated,125,,,1250 Qd,Glacial deposits -- Undifferentiated glacial drift,Quaternary,Undifferentiated glacial drift,,,KN008,825,Kenai,Unconsolidated,125,,,1250 Qmi,Moraine on ice,Quaternary,Superglacial and endglacial till on present glaciers,,,KN005,508,Kenai,Unconsolidated,126,,,1260 Qsm,Supraglacial moraine,"Quaternary, Holocene","Supraglacial moraine-- Unweathered, poorly sorted, debris on surfaces of glaciers.",,,CV003,130,Cordova,Unconsolidated,126,,,1260 Qsg,Superglacial drift,Quaternary,"Consists of unsorted boulder to fine-grained debris on the surface of modern glaciers. In the vicinity of Mount Redoubt and Mount Iliamna, may include a significant component of ash and other air-fall debris from eruptions",,,KN008,826,Kenai,Unconsolidated,126,,,1260 Qmi,Moraine on ice,Quaternary,Superglacial and endglacial till on present glaciers,,,SV004,508,Seldovia,Unconsolidated,126,,,1260 Qrg,Moraine,Quaternary,Rock glacier deposits,,,KN003,127,Kenai,Unconsolidated,127,,,1270 Qrg,Rock glaciers,"Quaternary, Holocene","Active and recently active rock glaciers. Chiefly rubble and coarse rock debris, interpreted from air photos",,,KN008,827,Kenai,Unconsolidated,127,,,1270 Qsf,Solifluction deposits,Quaternary,"Solifluction mantle, interpreted from airphotos. Thought to be poorly sorted sand, silt, and clay derived from local upslope bedrock sources.",,,KN008,828,Kenai,Unconsolidated,128,,,1280 Qgtn,"Glacial deposits, Tunnel Stade Alaskan Glaciation",Quaternary,"Barren moraine as much as 1-mile in front of present glaciers. Tunnel Stade, Alaskan Glaciation",,,KN005,505,Kenai,Unconsolidated,130,,,1301 Qgt,"Glacial deposits, Tustumena Stade Alaskan Glaciation",Quaternary,"Partially dissected moraine 1-6-mile in front of present glaciers; spruce and brush covered. Tustumena Stade, Alaskan Glaciation",,,KN005,506,Kenai,Unconsolidated,130,,,1302 Qm,"Terminal, lateral, and ground moraine","Quaternary, Holocene","Terminal, lateral and ground moraine-- Unsorted boulders, cobbles, gravel and sand deposited during retreat of glaciers.",,,CV003,135,Cordova,Unconsolidated,130,,,1300 tan,"Glacial deposits, undivided","Quaternary, Holocene",Glacial deposits,,,CV005,504,Cordova,Unconsolidated,130,,,1300 tan,"Younger glacial deposits, undivided","Quaternary, Holocene",glacial deposits ,,,CV006,510,Cordova,Unconsolidated,130,,,1300 Qag,"Alaskan glaciation, till, Cirque glaciations","Quaternary, Holocene?",Unsorted boulder to clay-size particles. Morainal landforms common as are till deposits along the margins of modern glaciers.,,,KN008,830,Kenai,Unconsolidated,130,,,1301 Qgtn,"Glacial deposits, Tunnel Stade Alaskan Glaciation",Quaternary,"Barren moraine as much as 1-mile in front of present glaciers. Tunnel Stade, Alaskan Glaciation",,,SV004,505,Seldovia,Unconsolidated,130,,,1301 Qmh,Glacial deposits,"Quaternary, Holocene","Glacial deposits of Holocene age, primarily ice-stagnation drift, outwash, and end moraine",,,KN011,1130,Kenai,Unconsolidated,130,,,1300 Qmh,Glacial deposits,"Quaternary, Holocene","Glacial deposits of holocene age, primarily ice-stagnation drift, outwash, and end moraine",,,SV005,1530,Seldovia,Unconsolidated,130,,,1300 Qag,Drift of Alaskan glaciation,"Quaternary, Holocene","Neoglacial deposits of end, lateral, and ground moraines, kames and outwash proximal to present glaciers; includes small rock glaciers. Diamicton, local gravel, and sand",,,CV004,711,Cordova,Unconsolidated,130,,,1300 Qgt,"Glacial deposits, Tustumena Stade Alaskan Glaciation",Quaternary,"Partially dissected moraine 1-6-mile in front of present glaciers; spruce and brush covered. Tustumena Stade, Alaskan Glaciation",,,SV004,506,Seldovia,Unconsolidated,130,,,1302 Qa,Moraines of Alaska Glaciation,"Quaternary, Holocene","Unmodified moraine deposits or mantled by loess, generally 2 to 6 feet thick",,,KN013,400,Kenai,Unconsolidated,130,,,1300 Qds,Glacial deposits -- Proglacial stratified drift (active outwash part),Quaternary,Includes stratified and locally foreset-bedded sand and gravel that occur below 125 m elevation on West Foreland and from Katchin Creek to Redoubt Point; these deposits are probable emerged delta and glaciolacustrine deposits. Also includes active outwash fans,,,KN006,604,Kenai,Unconsolidated,131,,,1310 Qdf,Glacial deposits -- Outwash fans,Quaternary,Moderately to heavily vegetated parts of outwash fans,,,KN006,605,Kenai,Unconsolidated,131,,,1310 Qo,Outwash deposits,Quaternary,"Poorly- to well-sorted silt, sand, and gravel in terraces and outwash fans plains",,,KN005,509,Kenai,Unconsolidated,131,,,1310 Qds?,Glacial deposits -- Proglacial stratified drift,Quaternary,Includes stratified and locally foreset-bedded sand and gravel that occur below 125 m elevation on West Foreland and from Katchin Creek to Redoubt Point; these deposits are probable emerged delta and glaciolacustrine deposits. Also includes active outwash fans,,,KN006,628,Kenai,Unconsolidated,131,,,1310 Qao,"Alaskan Glaciation, outwash","Quaternary, Holocene",Outwash deposits associated with modern and Holocene glaciers,,,KN008,831,Kenai,Unconsolidated,131,,,1310 Qo,Outwash deposits,Quaternary,"Poorly- to well-sorted silt, sand, and gravel in terraces and outwash fans plains",,,SV004,509,Seldovia,Unconsolidated,131,,,1310 Qao,Outwash and valley train deposits,"Quaternary, Holocene",Graded to moraines of Alaskan age and to existing glacier fronts,,,KN013,412,Kenai,Unconsolidated,131,,,1310 Qao,Outwash and valley train deposits,"Quaternary, Holocene",Graded to moraines of Alaskan age and to existing glacier fronts,,,SV007,412,Seldovia,Unconsolidated,131,,,1310 Qgn,"Glacial deposits, Naptowne Glaciation",Quaternary,Moderately weathered moraine along shoreline; heavily spruce and brush covered; Naptowne Glaciation,,,KN005,507,Kenai,Unconsolidated,135,,,1353 Qbl,Glacial deposits of the Naptowne glaciation,Quaternary,"Loop, recessional, lateral, and medial moraine and other deposits of the Brooks Lake glaciation",,,KN008,835,Kenai,Unconsolidated,135,,,1353 Qgn,"Glacial deposits, Naptowne Glaciation",Quaternary,Moderately weathered moraine along shoreline; heavily spruce and brush covered; Naptowne Glaciation,,,SV004,507,Seldovia,Unconsolidated,135,,,1353 Qbl,Glacial deposits of the Naptowne glaciation - ground moraine?,Quaternary,Probably ground moraine deposits of the Brooks Lake glaciation,,,KN008,8351,Kenai,Unconsolidated,135,,,1353 Qn,Moraines of Naptowne Glaciation,"Quaternary, Pleistocene","Prominent and little modified morainal deposits, mantled by 2 to 6 feet of loess",,,KN013,403,Kenai,Unconsolidated,135,,,1353 Qw4,"Brooks Lake drift, Iliuk Stade","Quaternary, Pleistocene","Brooks Lake drift, Iliuk Stade",,,KN008,836,Kenai,Unconsolidated,136,,,1360 Qnt,"Moraines of Naptowne Glaciation, Tanya advance","Quaternary, Pleistocene","Prominent and little modified morainal deposits, mantled by 2 to 6 feet of loess",,,KN013,404,Kenai,Unconsolidated,136,,,1363 Qnt,"Moraines of Naptowne Glaciation, Tanya advance","Quaternary, Pleistocene","Prominent and little modified morainal deposits, mantled by 2 to 6 feet of loess",,,SV007,404,Seldovia,Unconsolidated,136,,,1363 Qbln,"Brooks Lake, Newhalen moraine","Quaternary, Pleistocene",End moraine of the Newhalen advance of the Brooks Lake glaciation,,,KN008,837,Kenai,Unconsolidated,137,,,1370 Qns,"Moraines of Naptowne Glaciation, Skilak advance","Quaternary, Pleistocene","Prominent and little modified morainal deposits, mantled by 2 to 6 feet of loess",,,KN013,405,Kenai,Unconsolidated,137,,,1373 Qns,"Moraines of Naptowne Glaciation, Skilak advance","Quaternary, Pleistocene","Prominent and little modified morainal deposits, mantled by 2 to 6 feet of loess",,,SV007,405,Seldovia,Unconsolidated,137,,,1373 Qblil,"Brooks Lake, Iliamna moraine","Quaternary, Pleistocene",End moraine of the Iliamna advance of the Brooks Lake glaciation,,,KN008,838,Kenai,Unconsolidated,138,,,1380 Qnk,"Moraines of Naptowne Glaciation, Killey advance","Quaternary, Pleistocene","Prominent and little modified morainal deposits, mantled by 2 to 6 feet of loess",,,KN013,406,Kenai,Unconsolidated,138,,,1384 Qntm,"Moraines of Naptowne Glaciation, terraced moraines","Quaternary, Pleistocene","Discontinuously mantled below about the 500-ft strandline level with proglacial lake sediments of post Moosehorn, pre-Skilak age. Mantled by various thicknesses of glaciolacustrine deposits",,,KN013,408,Kenai,Unconsolidated,138,,,1384 Qnk,"Moraines of Naptowne Glaciation, Killey advance","Quaternary, Pleistocene","Prominent and little modified morainal deposits, mantled by 2 to 6 feet of loess",,,SV007,406,Seldovia,Unconsolidated,138,,,1384 Qntm,"Moraines of Naptowne Glaciation, terraced moraines","Quaternary, Pleistocene","Discontinuously mantled below about the 500-ft strandline level with proglacial lake sediments of post Moosehorn, pre-Skilak age. Mantled by various thicknesses of glaciolacustrine deposits",,,SV007,408,Seldovia,Unconsolidated,138,,,1384 Qnm,"Moraines of Naptowne Glaciation, Moosehorn advance","Quaternary, Pleistocene","Prominent and little modified morainal deposits, mantled by 2 to 6 feet of loess",,,KN013,407,Kenai,Unconsolidated,139,,,1393 Qnm,"Moraines of Naptowne Glaciation, Moosehorn advance","Quaternary, Pleistocene","Prominent and little modified morainal deposits, mantled by 2 to 6 feet of loess",,,SV007,407,Seldovia,Unconsolidated,139,,,1393 Qblo,"Outwash, Brooks Lake glaciation, undivided","Quaternary, Pleistocene","Outwash, Brooks Lake glaciation, undivided",,,KN008,840,Kenai,Unconsolidated,140,,,1400 Qno,Outwash and valley train deposits,"Quaternary, Pleistocene",Graded to moraines of Naptowne age,,,KN013,411,Kenai,Unconsolidated,140,,,1400 Qno,Outwash and valley train deposits,"Quaternary, Pleistocene",Graded to moraines of Naptowne age,,,SV007,411,Seldovia,Unconsolidated,140,,,1400 Qdl,Deltaic deposits,Quaternary,"Deltaic deposits, including outwash and alluvial deposits.",,,KN008,870,Kenai,Unconsolidated,170,,,1700 Qdc,Glacial deposits -- Pebble- and boulder-bearing diamicton,Quaternary,Pebble- and boulder-bearing diamicton. Observed at one upland location at West Foreland and in sea cliffs along West Foreland and from Katchin Creek south to near Redoubt Point.,,,KN006,606,Kenai,Unconsolidated,190,,,1900 Qdc?,Glacial deposits -- Pebble- and boulder-bearing diamicton,Quaternary,Pebble- and boulder-bearing diamicton. Observed at one upland location at West Foreland and in sea cliffs along West Foreland and from Katchin Creek south to near Redoubt Point.,,,KN006,633,Kenai,Unconsolidated,190,,,1900 Qk,Moraines of Knik Glaciation,"Quaternary, Pleistocene",Moraines of Knik Glaciation. Prominent but modified,,,KN013,416,Kenai,Unconsolidated,190,,,1903 Qe,Moraines of Eklutna Glaciation,"Quaternary, Pleistocene",Moraines of Eklutna Glaciation. Subdued and moderately modified,,,KN013,419,Kenai,Unconsolidated,190,,,1903 Qk,Moraines of Knik Glaciation,"Quaternary, Pleistocene",Moraines of Knik Glaciation. Prominent but modified,,,SV007,416,Seldovia,Unconsolidated,190,,,1903 Qe,Moraines of Eklutna Glaciation,"Quaternary, Pleistocene",Moraines of Eklutna Glaciation. Subdued and moderately modified,,,SV007,419,Seldovia,Unconsolidated,190,,,1903 Qk,Moraines of Knik Glaciation,"Quaternary, Pleistocene",Moraines of Knik Glaciation. Prominent but modified,,,SV007,416,Seldovia,Unconsolidated,190,,,1903 Qkt,Terraced moraines of Knik age,"Quaternary, Pleistocene",Terraced moraines of Knik age. Discontinuously manlted below the about 750 foot strandline level,,,KN013,417,Kenai,Unconsolidated,194,,,1943 Qet,Terraced moraines of Eklutna age,"Quaternary, Pleistocene","Terraced moraines of Eklutna age. Discontinuously manlted below the about 1,000 foot strandline level with proglacial lake sediments of Knik and Naptowne age",,,KN013,420,Kenai,Unconsolidated,194,,,1943 Qkt,Terraced moraines of Knik age,"Quaternary, Pleistocene",Terraced moraines of Knik age. Discontinuously manlted below the about 750 foot strandline level,,,SV007,417,Seldovia,Unconsolidated,194,,,1943 Qet,Terraced moraines of Eklutna age,"Quaternary, Pleistocene","Terraced moraines of Eklutna age. Discontinuously manlted below the about 1,000 foot strandline level with proglacial lake sediments of Knik and Naptowne age",,,SV007,420,Seldovia,Unconsolidated,194,,,1943 Qko,Outwash and valley train deposits,"Quaternary, Pleistocene",Outwash and valley train deposits. Graded to moraines of Knik age,,,KN013,418,Kenai,Unconsolidated,195,,,1953 Qeo,Outwash and valley train deposits,"Quaternary, Pleistocene",Outwash and valley train deposits. Graded to moraines of Eklutna age,,,KN013,421,Kenai,Unconsolidated,195,,,1953 Qko,Outwash and valley train deposits,"Quaternary, Pleistocene",Outwash and valley train deposits. Graded to moraines of Knik age,,,SV007,418,Seldovia,Unconsolidated,195,,,1953 Qeo,Outwash and valley train deposits,"Quaternary, Pleistocene",Outwash and valley train deposits. Graded to moraines of Eklutna age,,,SV007,421,Seldovia,Unconsolidated,195,,,1953 Qc,Moraines of Caribou Hills Glaciation,"Quaternary, Pleistocene",Moraines of Caribou Hills Glaciation. Greatly modified,,,KN013,422,Kenai,Unconsolidated,200,,,2000 Qc,Moraines of Caribou Hills Glaciation,"Quaternary, Pleistocene",Moraines of Caribou Hills Glaciation. Greatly modified,,,SV007,422,Seldovia,Unconsolidated,200,,,2000 Qct,Terraced moraines of Caribou Hills age,"Quaternary, Pleistocene","Terraced moraines of Caribou Hills age. Discontinuously mantled below the about 1,000 foot strandline level with proglacial lake sediments of Eklutna?, Knik, and Naptowne age",,,KN013,423,Kenai,Unconsolidated,201,,,2010 Qsb,Scoured bedrock,Quaternary,Glacially scoured bedrock; may be covered with thin glacially derived deposits; air-photo interpretation.,,,KN008,834,Kenai,Unconsolidated,275,,,2750 Qf,Other unconsolidated deposits -- artificial fill,"Quaternary, Holocene",Artificial fill at Drift River and West Foreland facilities,,,KN006,615,Kenai,Unconsolidated,295,,,2950 Qv,"Volcanic rocks, undivided",Quaternary,Lava flows and associated pyroclastic rocks associated with Iliamna Volcano,,,SV002,105,Seldovia,Igneous,300,,,300 Qv,Volcanic rocks,Quaternary (with mixed Tertiary?),"Lava, breccia, and associated pyroclastics. May include Tertiary volcanic rocks",,,KN002,300,Kenai,Igneous,300,,,3000 Qv,Volcanic rocks of Redoubt Volcano,Quaternary,Volcanic rocks of Redoubt Volcano,,,KN007,704,Kenai,Igneous,300,,,3000 Qv,"Volcanic rocks, undivided",Quaternary,"Consists of volcanic rocks and deposits associated with Iliamna, Redoubt, and Double Glacier volcanoes. Typically restricted to immediate vicinity of these volcanic centers, however locally, debris flows and air-fall material may be somewhat distal. Locally subdivided",,,KN008,850,Kenai,Igneous,300,,,3000 Qv,Quaternary volcanic rocks,Quaternary,Volcanic rocks of Iliamna and Redoubt volcanoes,,,KN012,1202,Kenai,Igneous,300,,,3000 Qil,Iliamna Lava flows,Quaternary,"Light-gray hypersthene-augite andesitic lava, breccia, and associated pyroclastic debris",,,KN005,511,Kenai,Igneous,305,,,3050 Hv,Holocene volcanic rocks,"Quaternary, Holocene","Holocene volcanic rocks, primarily associated with Redoubt Volcano",,,KN008,855,Kenai,Igneous,305,,,3050 Qil,Iliamna Lava flows,Quaternary,"Light-gray hypersthene-augite andesitic lava, breccia, and associated pyroclastic debris",,,SV004,511,Seldovia,Igneous,305,,,3050 Qtv,"Lava flows, North and South Twin volcanic center",Quaternary,Lava flows from the North and South Twin volcanic center. Probably andesitic,,,SV005,555,Seldovia,Igneous,305,,,3050 Qca,Ash-rich colluvium,"Quaternary, Holocene","Consists of tephra-rich colluvium in the vicinity of and west of Redoubt volcano. Similar to other volcanoes, these deposits probably consist of ash and larger-sized pyroclasts. On the flank of Redoubt Volcano, these deposits mantle and are incorporated in deposits that reflect Holocene glaciation. West of the volcano, they mantle bedrock and older glacial deposits. East of the volcano, they apparently cover one long low ridge -- this is apparently an erosional remnant as other ridges to the east do not seem to have these deposits.",,,KN008,861,Kenai,Igneous,311,,,3110 Qls,Deposits of Mass Wasting -- landslide deposits,Quaternary,"Deposits of landslides, including falls, slumps, slides, and failures by lateral spreading. Assigned NSA = 312 in vicinity of Polly Creek where this unit consists of debris flows from Mount Redoubt.",,,KN006,635,Kenai,Igneous,312,,,3120 Qm,Debris flow deposits,"Quaternary, Holocene","Debris flow deposits of Crescent River valley. Includes several small (older?) deposits in the upper valley and the 3,500-year-old debris flow in the lower valley",,,KN007,703,Kenai,Igneous,312,,,3120 Qdf2,"Debris flow deposits, older Redoubt flows","Quaternary, Holocene","Debris flow deposits of North Fork, Crescent River. Deposits of multiple debris flows off the west and southwest flanks Redoubt Volcano. Oldest(?) deposit is derived from west flank of Redoubt. Next oldest deposit appears derived from presently glaciated valley draining to the southwest off Redoubt. These deposits are of relatively limited extent. They may have dammed the North Fork of the Crescent River, creating a temporary lake in the valley",,"Radiocarbon date of about 3,500 yrs. BP on youngest and most extensive debris flow.",KN008,8621,Kenai,Igneous,312,,,3121 Qdf1,"Debris flow deposits, younger Redoubt flows","Quaternary, Holocene","Debris flow deposits of North Fork, Crescent River. Deposits of the youngest, most extensive, and probably most fluid debris flow derived from southwest flank of Redoubt Volcano. Flow was apparently derived from a presently glacier free valley draining south from Redoubt. This debris flow has been dated at 3,500 yrs. BP, young enough to possibly explain lack of glaciers in the source valley, as all surrounding valleys have extensive glaciers and glacial deposits. This debris flow extends to coast of Cook Inlet and back flowed up the main fork of the Crescent River, creating Crescent Lake",,"Radiocarbon date of about 3,500 yrs. BP on youngest and most extensive debris flow.",KN008,8622,Kenai,Igneous,312,,,3122 Ql,Lahar deposits,"Quaternary, Holocene",Lahar deposits,,,KN011,1162,Kenai,Unconsolidated,312,,,3120 Qdfn,"Debris flow deposits, younger Redoubt flows","Quaternary, Holocene",Debris flow deposits on the north flank of Redoubt Volcano in the Drift River valley,,,KN008,862,Kenai,Igneous,312,,,3122 none,Areas in Drift River valley subjected to flood scour or deposition by 1966 floods,"Quaternary, Holocene",Areas in Drift River valley subjected to flood scour or deposition by 1966 floods,,,KN007,706,Kenai,Unconsolidated,313,,,3130 pattern,Areas on Drift River delta subjected to flood scour or deposition prior to 1966,"Quaternary, Holocene",Areas on Drift River delta subjected to flood scour or deposition in the several decades before 1966,,,KN007,708,Kenai,Unconsolidated,313,,,3130 Qdr1,Younger Drift River delta mudflow deposits prior to 1957,"Quaternary, Holocene","Areas of mudflow deposits, tending to be minimally vegetated and relatively close to channel of Drift River",,,KN008,8632,Kenai,Unconsolidated,313,,,3130 Qdr2,Older Drift River delta mudflow deposits,"Quaternary, Holocene","Areas of mudflow deposits, tending to be more heavily vegetated and tending to control location of Drift River channels",,,KN008,8631,Kenai,Unconsolidated,313,,,3130 Qdr,"Drift River delta mudflow deposits, undifferentiated","Quaternary, Holocene","Areas of mudflow deposits, not easily separatable into the Younger and Older events",,,KN008,863,Kenai,Unconsolidated,313,,,3130 Qav,Volcanic avalanche deposits,"Quaternary, Holocene","Volcanic avalanche deposits consisting of poorly sorted mixture of angular sand, cobbles, and boulders. All deposits contain clasts of gray andesitic lava and yellow-orange hydrothermally altered rocks. Estimated age is less than 1,000 years and some may be historic (< 200 years)",,,KN011,1164,Kenai,Igneous,314,,,3140 Qv,Quaternary volcanic rocks,"Quaternary, Pleistocene",Composite dome complex consisting of medium- to coarsely porphyritic hornblende andesite and dacite.,,"Three K-Ar whole-rock ages, two considered minimum ages at 627 and 763 ka and one of 887 ka.",KN009,901,Kenai,Igneous,402,,,4020 Ts,Sterling Formation,"Tertiary, Pliocene and Miocene","Interbedded, weakly lithified sandstone, siltstone, mudstone, carbonaceous shale, lignite coal, and minor volcanic ash.",,,SV002,80,Seldovia,Sedimentary,540,,, Tks,Sterling Formation,"Tertiary, Pliocene and Miocene","Sandstone, siltstone, and some coal",,,KN002,540,Kenai,Sedimentary,540,,, Tks,Sterling Formation,"Tertiary, Pliocene and Miocene","Sandstone, siltstone, and some coal",,,SV010,107,Seldovia,Sedimentary,540,,, Tb,Beluga Formation,"Tertiary, Miocene","Interbedded, weakly lithified sandstone, siltstone, mudstone, carbonaceous shale, coal, and minor volcanic ash.",,,SV002,78,Seldovia,Sedimentary,545,,, Tkb,Beluga Formation,Miocene,"Sandstone, siltstone, and coal",,,SV010,108,Seldovia,Sedimentary,545,,, Tk,Kenai Group,Tertiary,"Coal-bearing semi-consolidated silt, sand, and gravel near Tustumena Glacier. Possibly equivalent to the Sterling Formation?",,,KN003,3560,Kenai,Sedimentary,560,,, Tk,Kenai Formation,"Tertiary, Eocene","Semiconsolidated coal-bearing silt, sand, and gravel",,,KN013,300,Kenai,Sedimentary,560,,, Tk,Kenai Formation,"Tertiary, Eocene","Semiconsolidated coal-bearing silt, sand, and gravel",,,SV007,300,Seldovia,Sedimentary,560,,, Tk,Kenai Formation,"Tertiary, Eocene","Interbedded, poorly consolidated sandstone, siltstone, claystone, and minor amounts of conglomerate. Contains many beds of subbituminouos coal and lignite",,,KN014,143,Kenai,Sedimentary,560,,, bT,Tertiary bedrock,Tertiary,"Kenai Group and West Foreland Formation; nonmarine sandstone, siltstone, shale, and claystone and local coal",,,KN006,621,Kenai,Sedimentary,561,,, bT?,Tertiary bedrock,Tertiary,"Kenai Group and West Foreland Formation; nonmarine sandstone, siltstone, shale, and claystone and local coal",,,KN006,634,Kenai,Sedimentary,561,,Q, Ty,Yakataga Formation,"Tertiary, Miocene","Consists of diverse marine and glaciomarine clastic rocks. Interbedded gray to dark-gray and greenish-gray siltstone, mudstone, and sandstone predominate in the lower part of the formation. Till-like diamictite is interbedded with siltstone in all but the lowest part of the formation and is the dominant rock type in the upper part of the formation, particularly on Middleton Island. Conglomerate is a minor lithology throughout the formation and scattered clasts - presumably dropstones- are present in all lithologies. Sandstone and conglomerate combined constitute about 10 percent of the section on Kayak Island and about 12 percent on Middleton Island","mollusks, foraminifers",,MI002,220,Middleton Island,Sedimentary,565,,, QTy,Yakataga Formation,"Quaternary, Pleistocene to Tertiary, Miocene","Consists of diverse marine and glaciomarine clastic rocks. Interbedded gray to dark-gray and greenish-gray siltstone, mudstone, and sandstone predominate in lower third of formation. Till-like diamictite dominant rock type in upper part of formation.",,,MI003,215,Cordova,Sedimentary,565,,, Tt,Tyonek Formation,"Tertiary, Miocene and Oligocene","Conglomerate and subordinate sandstone, siltstone, and coal",,,SV002,81,Seldovia,Sedimentary,600,,, Tkt,Tyonek Formation,Miocene and Oligocene,"Sandstone, siltstone, coal, and conglomerate",,,SV010,106,Seldovia,Sedimentary,600,,, Tkth,Tyonek Formation and Hemlock Conglomerate (undivided),"Tertiary, Miocene and Oligocene","Sandstone, conglomerate, and siltstone",,,KN002,630,Kenai,Sedimentary,630,,,2750 Tr,Redwood Formation,"Tertiary, Pliocene to Oligocene?","Lower sandstone member: about two-thirds thick-bedded sandstone and one-third silty sandstone and siltstone. Upper member: about one-half siltstone, mudstone and claystone, the rest is conglomerate and sandstone.",,,CV003,230,Cordova,Sedimentary,675,,, Tr,Redwood Formation,"Tertiary, Oligocene (?) and Miocene","Marine siltstone, sandstone, and conglomerate. The sandstone member consists of about two-thirds thick-bedded sandstone and one-third silty sandstone and siltstone. The characteristic conglomeratic beds show complete gradation from coarse, clast-supported conglomerate to matrix-supported conglomeratic mudstone and sandstone in which coarse clasts are suspended in the matrix. The siltstone, mudstone, and claystone are similar in appearance to parts of the underlying Poul Creek Formation, but they contain few or no concretions, no glauconitic or volcanic beds, and are sandier and more resistant to erosion","mollusks, and foraminifera",,CV002,30,Cordova,Sedimentary,675,,, Tps,"Sedimentary rocks, undivided (Poul Creek Formation)","Tertiary, Miocene, Oligocene, and Eocene","Concretionary pyritic, and glauconitic reddish-weathering, dark-gray to greenish-gray siltstone, claystone, and sandstone with subordinate dark-brown, laminated organic-rich shale, and gray calcareous sandstone; also includes thin interbeds of basaltic tuff locally. Occurrence of shales as much as 800 ft thick that have high organic-carbon contents (as much as 7.57 percent), extractable petroleum (0.8 gallons per ton), abundant glauconite, and common pyrite are suggestive of deposition in part under conditions of restricted bottom circulation. Intercalated basaltic fragmental rocks and less common pillow basalt (unit Tpv) indicate episodic submarine mafic volcanism in the basin.","mollusks, and foraminifera",,MI002,235,Middleton Island,Sedimentary,680,,, Tps,"Poul Creek Formation: Sedimentary rocks, undivided","Tertiary, Miocene, Oligocene, and Eocene","Concretionary, pyritic, glauconitic, reddish-weathering, dark-gray to greenish-gray siltstone, claystone, and sandstone; shale that is rich in organic material; gray calcareous sandstone; local thin interbeds of basaltic tuff.",,,CV003,235,Cordova,Sedimentary,680,,, Tps,"Poul Creek Formation: Sedimentary rocks, undivided","Tertiary, Miocene, Oligocene, and Eocene","Concretionary pyritic, and glauconitic reddish-weathering, ark-gray to greenish-gray siltstone, claystone, and sandstone with subordinate dark-brown, laminated organic-rich shale, and gray calcareous sandstone; also includes thin interbeds of basaltic tuff locally. Occurrence of shales as much as 800 ft thick that have high organic-carbon contents (as much as 7.57 percent), extractable petroleum (0.8 gallons per ton), abundant glauconite, and common pyrite are suggestive of deposition in part under conditions of restricted bottom circulation. Intercalated basaltic fragmental rocks and less common pillow basalt (unit Tpv) indicate episodic submarine mafic volcanism in the basin.","mollusks, and foraminifera",,CV002,35,Cordova,Sedimentary,680,,, Tps,"Poul Creek Formation: Sedimentary rocks, undivided","Tertiary, Miocene, Oligocene, and Eocene","Concretionary, pyritic, glauconitic, reddish-weathering, dark-gray to greenish-gray siltstone, claystone, and sandstone; shale that is rich in organic material; gray calcareous sandstone; local thin interbeds of basaltic tuff.",,,MI003,235,Middleton Island,Sedimentary,680,,, Tt,Tokun Formation,"Tertiary, Eocene","Consists predominantly of concretionary siltstone and lesser, variable amount of interbedded sandstone. Siltstone is medium to dark gray and nearly massive. Spheroidal calcareous concretions as much as 1 m in maximum dimension are distributed randomly or along bedding surfaces in the siltstone.",,,CV003,240,Cordova,Sedimentary,810,,, Tt,Tokun Formation,"Tertiary, Oligocene and Eocene","A transgressive marine sequence. Consists predominantly of concretionary siltstone with a lesser and variable amount of interbedded sandstone, chiefly in the lower part of the formation. The siltstone generally is medium to dark gray and nearly massive; in places, thin beds and lenses of lighter gray brown-weathering calcareous siltstone and silty limestone occur within the darker siltstone. Interbedded sandstone in the Tokun, which generally is lighter gray than the siltstone, is micaceous, feldspathic, and brown-weathering.","crabs, and mollusks",,CV002,40,Cordova,Sedimentary,810,,, Ts,Stillwater Formation,"Tertiary, Eocene","Dense hard dark-gray siltstone. Where siltstone is carbonaceous, it has a coalike appearance; where its calcareous, it may be variegated from reddish brown to pale green",foraminifers,,CV003,256,Cordova,Sedimentary,820,,, Ts,Stillwater Formation,"Tertiary, Eocene","The dominant lithology is dense hard dark-gray siltstone. Where the siltstone is carbonaceous, it has a coaly appearance; where it is calcareous, the siltstone may be variegated in shades of reddish brown to pale green and usually contains foraminifers. The upper part of the formation indicates regressive shallow marine deposition. In this area the Stillwater intertongues with, and grades upward into, the shallow marine and nonmarine Kulthieth Formation. The Stillwater Formation is complexly deformed and is characterized by tight folds and shearing in incompetent strata; hence, its thickness can be only estimated to be at least 4,918 ft. ","foraminifers, and mollusks",,CV002,255,Cordova,Sedimentary,820,,, Twf,West Foreland Formation,"Tertiary, Eocene","Poorly sorted polymictic conglomerate, graywacke, and siltstone; having interbedded tuff and local subaerial basalt flows.",,,SV002,79,Seldovia,Sedimentary,855,,, Twf,West Foreland Formation,"Tertiary, Eocene and Paleocene","Conglomerate, sandstone, and siltstone; mostly tuffaceous",,,KN002,855,Kenai,Sedimentary,855,,,2750 Tk,Kenai Formation,"Tertiary, Miocene and Oligocene(?)","Tan to light-yellow-brown conglomerate, sandstone, and laminated siltstone; few thin coal beds",,,SV004,513,Seldovia,Sedimentary,855,,, Twf?,West Foreland Formation,"Tertiary, Eocene and Paleocene","Conglomerate, sandstone, and siltstone; mostly tuffaceous, inferred from air photos, covered by thin glacial deposits",,,KN008,820,Kenai,Sedimentary,855,,Q,2750 Tk,Kulthieth Formation,"Tertiary, Eocene","Massive to thin-bedded, coal-bearing, arkosic sandstone, dark-gray to black carbonaceous siltstone and shale, and minor coal. Sandstone and shale ratios in measured sections average about 1:1. Sandstone varies from massive intervals as much as 150 m thick to thin bedded and shaly. Bituminous to semi-anthracite coal in beds as much as 3 m thick is a conspicuous, but minor part of the sequence. Commonly intensely deformed into imbricated stacks of fault-bounded chevron folds with shearing and structural thinning and thickening of coal beds. Mostly nonmarine and has minor tongues of transitional marine strata lithologically similar to the underlying Stillwater Formation and overlying Tokun Formation","plants, and mollusks ",,CV002,250,Cordova,Sedimentary,860,,, Tk,Kulthieth Formation,"Tertiary, Eocene","Includes at least 1,500 m of interbedded, massive to thin-bedded, coal-bearing arkosic sandstone, dark-gray to black carbonaceous siltstone and shale, and minor coal. Commonly intensely deformed into imbricated stacks of fault-bounded chevron folds.",,,CV003,250,Cordova,Sedimentary,860,,, Tos,"Orca Group -- Sedimentary rocks, undivided","Tertiary, Paleocene and early Eocene (?)","Dark-gray flysch of thin- to thick-bedded sandstone, pebbly sandstone, siltstone, mudstone, and locally conglomerate and limestone; sandstone is composed chiefly of quartz and plagioclase; conglomerate clasts are mainly felsic porphyry and granite",,,BS004,13,Blying Sound,Sedimentary,950,,, Toss,Orca Group: Siltstone,"Tertiary, Paleocene and early Eocene (?)","Dark-gray to black siltstone, mudstone, and minor fine-grained sandstone that is tightly folded and metamorphosed to slate; medium-gray and green lenses of micritic limestone as much as 2 m thick present locally in slate; olistostromes of siltstone present locally; same sedimentary rock types are included in sedimentary rock-greenstone map units containing basalt sills (Togs) and pillow basalt (Tops).",,,BS004,15,Blying Sound,Sedimentary,950 Tos,"Orca Group -- Sedimentary rocks, undivided","Tertiary, Paleocene and early Eocene (?)","Dark-gray flysch of thin- to thick-bedded sandstone, pebbly sandstone, siltstone, mudstone, and locally conglomerate and limestone; sandstone is composed chiefly of quartz and plagioclase; conglomerate clasts are mainly felsic porphyry and granite",,,SR004,13,Seward,Sedimentary,950 Toss,Orca Group: Siltstone,"Tertiary, Paleocene and early Eocene (?)","Dark-gray to black siltstone, mudstone, and minor fine-grained sandstone that is tightly folded and metamorphosed to slate; medium-gray and green lenses of micritic limestone as much as 2 m thick present locally in slate; olistostromes of siltstone present locally; same sedimentary rock types are included in sedimentary rock-greenstone map units containing basalt sills (Togs) and pillow basalt (Tops).",,,SR004,15,Seward,Sedimentary,950 Tos,"Orca Group -- Sedimentary rocks, undivided","Tertiary, Eocene (?) and Paleocene","A sequence of thin- to thick-bedded sandstone, siltstone, and mudstone. Abundant sedimentary structures, such as graded bedding, crossbedding, and ripple marks, along with flute, groove, and load casts, indicate deposition from turbidity currents. Sandstone is more abundant than finer-grained rocks. Limestone lenses or concretions are found locally, and these, along with the earlier mentioned conglomerates, are characteristic of sedimentary rocks belonging to the Orca Group. Thin-section petrography indicates that most of the sandstones are feldspathic to feldspatholithic.","Pollen: Alnus (Alder) Foraminifers: Globogerina sp., G. senni, Globogerina sp. (hispid), Globorotalia sp. Echinoids: Holaster sp. ?Hypsopygaster sp., Nucleopygus",,BS002,271,Blying Sound,Sedimentary,950 Tos,"Orca Group -- Sedimentary rocks, undivided","Tertiary, Eocene (?) and Paleocene","A sequence of thin- to thick-bedded sandstone, siltstone, and mudstone. Abundant sedimentary structures, such as graded bedding, crossbedding, and ripple marks, along with flute, groove, and load casts, indicate deposition from turbidity currents. Sandstone is more abundant than finer-grained rocks. Limestone lenses or concretions are found locally, and these, along with the earlier mentioned conglomerates, are characteristic of sedimentary rocks belonging to the Orca Group. Thin-section petrography indicates that most of the sandstones are feldspathic to feldspatholithic.","Pollen: Alnus (Alder) Foraminifers: Globogerina sp., G. senni, Globogerina sp. (hispid), Globorotalia sp. Echinoids: Holaster sp. ?Hypsopygaster sp., Nucleopygus",,SR002,271,Seward,Sedimentary,950 Tos,"Orca Group -- Sedimentary rocks, undivided","Tertiary, Eocene and Paleocene","Very thick, complexly deformed monotonous sequence of thin- to thick-bedded turbidites consisting of sandstone, siltstone, and mudstone; metamorphosed to zeolite or prehnite-pumpellyite facies. Abundant sedimentary features indicate deposition from sediment gravity flows on submarine-fan complex. Lenticular matrix-supported conglomerate, and pebbly mudstone and sandstone are widespread.","planktonic foraminifers, fossil crabs, pelecypods and gastropods",,CV003,271,Cordova,Sedimentary,950 Tos,"Orca Group -- Sedimentary rocks, undivided","Tertiary, Eocene (?) and Paleocene","A sequence of thin- to thick-bedded sandstone, siltstone, and mudstone. Abundant sedimentary structures, such as graded bedding, crossbedding, and ripple marks, along with flute, groove, and load casts, indicate deposition from turbidity currents. Sandstone is more abundant than finer-grained rocks. Limestone lenses or concretions are found locally, and these, along with the earlier mentioned conglomerates, are characteristic of sedimentary rocks belonging to the Orca Group. Thin-section petrography indicates that most of the sandstones are feldspathic to feldspatholithic.","Pollen: Alnus (Alder), Foraminifers: Globogerina sp., G. senni, Globogerina sp. (hispid), Globorotalia sp., Echinoids: Holaster sp., ?Hypsopygaster sp., Nucleopygus",,CV002,71,Cordova,Sedimentary,950 Tosb,Orca Group - Massive sandstone (Lithofacies B),Eocene and Paleocene,"Gray to tan, massive bedded, fine to medium grained sandstone. Beds range in thickness from 2 m to over 5 m. Locally contains interbedded interval of well bedded turbidites of lithofacies C (Mutti and Ricci Lucchi, 1978). Massive sandstone is predominant in a belt that extends from the Special Study Area to the southwestern part of the Chugach National Forest. Dish structures are locally common",,,SR005,3086,Seward,Sedimentary,950 Tosc,"Orca Group - ""Typical"" turbidites",Eocene and Paleocene,"Gray, well bedded, fine to medium grained, alternating layers of sandstone, siltstone, and shale. Beds are in layers less than or equal to 2 m thick. This lithologic association led to the original definition of turbidites (Mutti and Ricci Lucchi, 1978). Commonly displays nearly complete Bouma sequences (Bouma, 1962). Primary sedimentary features are common and include well-developed graded bedding, cross-bedding, load and flute casts, dish structures, and fine-scale laminations. Probably deposited in the middle part of a deep sea fan that had local inner fan deposits representing feeder and distributary channels with the fan complex",,,SR005,3093,Seward,Sedimentary,950 Tosd,Orca Group - Rythmite (sp.) (Lithofacies D),Eocene and Paleocene,"Dark gray, well bedded, fine grained, siltstone, and shale in beds 5 cm or less in thickness. Probably represents a distal facies of Tosc. Occurs in local map scale outcrops on the southern side of Fairmount Island and the west side of Wells Bay",,,SR005,3097,Seward,Sedimentary,950 Tosf,Orca Group,Eocene and Paleocene - Chaotic deposits (Lithofacies F),"Dark gray, contorted, fine grained shale. Irregular blocks of rythmite (sp.) and sandstone in a chaotically folded shale host. Probably represent deposition of large slump blocks along submarine canyon walls or the slope environment. The outcrops along the west side of Long Bay are the only known occurrence of this lithofacies in the Orca Group (Nelson and others, 1985)",,,SR005,3088,Seward,Sedimentary,950 Tosg,Orca Group - Shale or argillite (Lithofacies G),Eocene and Paleocene,"Dark gray, massive argillite or thin bedded shale. Outcrop occurs in a north-trending band north of Eickelberg Bay",,,SR005,3033,Seward,Sedimentary,950 Tosbd,Orca Group - Massive sandstone and rythmite (sp.)(Lithofacies B and D),Eocene and Paleocene,"Interbedded intervals, undivided at map scale, of tan, massive channel sandstones and rythmite (sp.). Rythmite (sp.) interval probably represents overbank deposits",,,SR005,3085,Seward,Sedimentary,950 Tops,Orca Group: Pillow basalt and sedimentary rocks,"Tertiary, Paleocene and early Eocene (?)","Areas composed of about equal amounts of pillow basalt and interbedded sedimentary rocks of sandstone and subordinate siltstone. Present chiefly on Erlington, Evans, and Bainbridge Islands.",Foraminifers. probably Globigerina or Subbotina Probably Tertiary (specimens poorly preserved),,BS004,19,Blying Sound,Igneous,951 Togs,Orca Group: Greenstone and sedimentary rocks,"Tertiary, Paleocene and early Eocene (?)","Basalt sills intrude metasedimentary rocks, chiefly slate, on Elrington, Evans, and Bainbridge Islands; basalt sills and dikes in slate and sandstone on Knight Island",,,BS004,23,Blying Sound,Metamorphic,951 Tops,Orca Group: Pillow basalt and sedimentary rocks,"Tertiary, Paleocene and early Eocene (?)","Areas composed of about equal amounts of pillow basalt and interbedded sedimentary rocks of sandstone and subordinate siltstone. Present chiefly on Erlington, Evans, and Bainbridge Islands.",Foraminifers. probably Globigerina or Subbotina Probably Tertiary (specimens poorly preserved),,SR004,19,Seward,Igneous,951 Togs,Orca Group: Greenstone and sedimentary rocks,"Tertiary, Paleocene and early Eocene (?)","Basalt sills intrude metasedimentary rocks, chiefly slate, on Elrington, Evans, and Bainbridge Islands; basalt sills and dikes in slate and sandstone on Knight Island. Greenstone and sedimentary rocks",,,SR004,23,Seward,Metamorphic,951,, Tosv,Orca Group -- Interbedded sedimentary and mafic volcanic rocks,"Tertiary, Eocene (?) and Paleocene","Locally variable amounts of volcanic and sedimentary rocks. In some cases unit is marginal to thicker sequences composed of pillowed and massive basalt flows. The lithologies are quite variable throughout the study area. In Ragged mountains volcaniclastic and tuffaceous sedimentary rocks are abundant, and pillow basalt is rare. These rocks are typically metamorphosed to zeolite or prehnite-pumpellyite facies and on Knight Island they have been converted to a hard hornfels by the abundant sills(?). Interbedded sedimentary and mafic volcanic rocks","Foraminifers: Globigerina or Subbotina; Globigerina sp. (?) Globorotalia sp.; Globigerina cf. G. senni, Globorotalia sp., ?Eoconuloides parvulus, Globigerina sp. (high spired), Globigerina sp. (hispid)",,BS002,332,Blying Sound,Sedimentary,951,,HFS Tops,Orca Group -- Pillow basalt and sedimentary rocks,"Tertiary, Eocene (?) and Paleocene","Pillow basalt, massive basalt flows, minor volcanic breccia interbedded with sandstone, siltstone, and shale. Distinguished from the interbedded sedimentary and mafic volcanic rocks unit on the basis of the predominance of pillow basalt in the section. Probably gradational with the pillow basalt unit. Two measured sections on Ellamar Mountain show significant differences in the percent of interbedded volcanic and sedimentary rocks that reflect rapid lensing out of units probably due to the presence of an irregular paleosurface. One section contains 92 percent volcanic rocks and 8 percent sedimentary rocks, and the other section about 1,200 ft laterally distant contains 75 percent volcanic rocks and 25 percent sedimentary rocks.",,,SR002,331,Seward,Igneous,951,, Tosv,Orca Group -- Interbedded sedimentary and mafic volcanic rocks,"Tertiary, Eocene (?) and Paleocene","Locally variable amounts of volcanic and sedimentary rocks. In some cases unit is marginal to thicker sequences composed of pillowed and massive basalt flows. The lithologies are quite variable throughout the study area. In Ragged mountains volcaniclastic and tuffaceous sedimentary rocks are abundant, and pillow basalt is rare. These rocks are typically metamorphosed to zeolite or prehnite-pumpellyite facies and on Knight Island they have been converted to a hard hornfels by the abundant sills(?). Interbedded sedimentary and mafic volcanic rocks","Foraminifers: Globigerina or Subbotina; Globigerina sp. (?) Globorotalia sp.; Globigerina cf. G. senni, Globorotalia sp., ?Eoconuloides parvulus, Globigerina sp. (high spired), Globigerina sp. (hispid)",,SR002,332,Seward,Sedimentary,951,,HFS Tovs,Orca Group -- Interbedded sedimentary and volcanic rocks,"Tertiary, Eocene and Paleocene","Variable proportions of interbedded, tholeiitic basalt and turbidites. Basalt--pillowed and massive flows, pillow breccia, and tuff. Turbitdites--mudstone, siltstone, and fossiliferous volcanogenic sandstone. Metamorphosed to zeolite or prehnite-pumpellyite facies.",,,CV003,335,Cordova,Sedimentary,951,, Tosv,Orca Group -- Interbedded sedimentary and mafic volcanic rocks,"Tertiary, Eocene (?) and Paleocene","Locally variable amounts of volcanic and sedimentary rocks. In some cases unit is marginal to thicker sequences composed of pillowed and massive basalt flows. The lithologies are quite variable throughout the study area. In Ragged mountains volcaniclastic and tuffaceous sedimentary rocks are abundant, and pillow basalt is rare. These rocks are typically metamorphosed to zeolite or prehnite-pumpellyite facies and on Knight Island they have been converted to a hard hornfels by the abundant sills(?). Interbedded sedimentary and mafic volcanic rocks","Foraminifers: Globigerina or Subbotina; Globigerina sp. (?) Globorotalia sp.; Globigerina cf. G. senni, Globorotalia sp., ?Eoconuloides parvulus, Globigerina sp. (high spired), Globigerina sp. (hispid)",,CV002,332,Cordova,Sedimentary,951,,HFS Tops,Orca Group -- Pillow basalt and sedimentary rocks,"Tertiary, Eocene (?) and Paleocene","Pillow basalt, massive basalt flows, minor volcanic breccia interbedded with sandstone, siltstone, and shale. Distinguished from the interbedded sedimentary and mafic volcanics rocks unit on the basis of the predominance of pillow basalt in the section. Probably gradational with the pillow basalt unit. Two measured sections on Ellamar Mountain show significant differences in the percent of interbedded volcanic and sedimentary rocks that reflect rapid lensing out of units probably due to the presence of an irregular paleosurface. One section contains 92 percent volcanic rocks and 8 percent sedimentary rocks, and the other section about 1,200 ft laterally distant contains 75 percent volcanic rocks and 25 percent sedimentary rocks.",,,CV002,331,Cordova,Igneous,951,, Tops,Orca Group: Pillow basalt and sedimentary rocks,"Tertiary, Eocene (?) and Paleocene","Pillow basalt, massive basalt flows, minor volcanic breccia interbedded with sandstone, siltstone, and shale. Distinguished from the interbedded sedimentary and mafic volcanics rocks unit on the basis of the predominance of pillow basalt in the section. Probably gradational with the pillow basalt unit. Two measured sections on Ellamar Mountain show significant differences in the percent of interbedded volcanic and sedimentary rocks that reflect rapid lensing out of units probably due to the presence of an irregular paleosurface. One section contains 92 percent volcanic rocks and 8 percent sedimentary rocks, and the other section about 1,200 ft laterally distant contains 75 percent volcanic rocks and 25 percent sedimentary rocks.",,,CV002,331,Cordova,Igneous,951,, Tosv,Ophiolite of Glacier Island - Volcaniclastic rocks,,"Dark gray to green, moderate to well bedded volcanic mudstone and sandstone, poorly sorted, broken pillow breccia with angular clasts of pillow basalt, ranging in size from a few centimeters to 15-cm across, in a volcanic mudstone matrix, and rare pillow basalt flows up to 2-m thick. Forms the upper part of the ophiolite and is depositional on pillow basalt unit",,,SR005,3120,Seward,Sedimentary,951,, Toc,Orca Group: Conglomerate,"Tertiary, Eocene (?) and Paleocene","ORCA GROUP: Ranges from matrix-supported pebbly mudstone and sandstone to massive clast-supported pebble, cobble, and boulder conglomerate. The generally well-rounded clasts consist of various lithologies that have locally predominant types as follows: greenstone, sandstone, argillite, and limestone; felsic porphyry and tuff, granite, and sandstone; felsic tuff and porphyry; white quartz, felsic porphyry, and argillite; sandstone and siltstone. The conglomerates usually occur as lenses 300-700 ft thick within flyschoid rocks. The matrix-supported conglomerates and pebbly mudstones may have been formed by sub-marine landslides on unstable slopes.",Crab: Branchioplax washingtoniana Pelecypod: Acila decisa,,BS002,270,Blying Sound,Sedimentary,952,, Toc,Orca Group: Conglomerate,"Tertiary, Eocene (?) and Paleocene","ORCA GROUP: Ranges from matrix-supported pebbly mudstone and sandstone to massive clast-supported pebble, cobble, and boulder conglomerate. The generally well-rounded clasts consist of various lithologies that have locally predominant types as follows: greenstone, sandstone, argillite, and limestone; felsic porphyry and tuff, granite, and sandstone; felsic tuff and porphyry; white quartz, felsic porphyry, and argillite; sandstone and siltstone. The conglomerates usually occur as lenses 300-700 ft thick within flyschoid rocks. The matrix-supported conglomerates and pebbly mudstones may have been formed by sub-marine landslides on unstable slopes.",Crab: Branchioplax washingtoniana Pelecypod: Acila decisa,,SR002,270,Seward,Sedimentary,952,, Toc,Orca Group: Conglomerate,"Tertiary, Eocene and Paleocene","Massive, clast-supported, well-rounded pebble, cobble, and boulder conglomerate. Variable clast composition.",,,CV003,270,Cordova,Sedimentary,952,, Toc,Orca Group: Conglomerate,"Tertiary, Eocene (?) and Paleocene","Ranges from matrix-supported pebbly mudstone and sandstone to massive clast-supported pebble, cobble, and boulder conglomerate. The generally well-rounded clasts consist of various lithologies that have locally predominant types as follows: greenstone, sandstone, argillite, and limestone; felsic porphyry and tuff, granite, and sandstone; felsic tuff and porphyry; white quartz, felsic porphyry, and argillite; sandstone and siltstone. The conglomerates usually occur as lenses 300-700 ft thick within flyschoid rocks. The matrix-supported conglomerates and pebbly mudstones may have been formed by sub-marine landslides on unstable slopes.",Crab: Branchioplax washingtoniana Pelecypod: Acila decisa,,CV002,70,Cordova,Sedimentary,952,, Tosa,Orca Group - Conglomerate (Lithofacies A),Eocene and Paleocene,"Dark gray, poorly-bedded to massive, matrix-supported pebbly mudstone and sandstone to pebble, cobble, and boulder conglomerate. Minor lenses of sandstone and less or amounts of siltstone. Clasts are usually well-rounded and predominately sandstone and siltstone. Only one felsic igneous rock clast was observed. The thickest occurrence of conglomerate is found on the east side of Unakwik Inlet just of Miners Bay. Here the conglomerate unit nearly 1,000-m-thick and the outcrops are part of a large northeast-trending fold. Depositional environment probably in submarine landslides on unstable slopes and large channel deposits on the slope and upper parts of deep-sea fans (Winkler and Tysdal, 1977)",,,SR005,3096,Seward,Sedimentary,952,, Tots,Orca Group -- Tuffaceous sedimentary rocks,"Tertiary, Eocene (?) and Paleocene","Tuffaceous sedimentary rocks, volcaniclastic sandstone, and minor chert. Locally, these rocks contain abundant radiolarians and diatoms of probable Tertiary age (table 2). South of the Martin fault, this unit also includes minor pillow basalt and abundant volcanic breccia. The rocks are altered to a bright orange-weathering gossan and are intruded by numerous porphyritic dikes for a distance of 10 mi along the south side of the Martin fault.","Diatoms: Arachinodiscus cf., A. ehrenbergii, Trinacria ef., T. pileclus Silicoflagellates: ?Corbisema geometrica, ?Corbisema hastata, ?Corbisema triacontha, Dictyocha aspera, Navoculopgis constricta",,MI002,272,Middleton Island,Sedimentary,953,, Tots,Orca Group -- Tuffaceous sedimentary rocks,"Tertiary, Eocene (?) and Paleocene","Tuffaceous sedimentary rocks, volcaniclastic sandstone, and minor chert. Locally, these rocks contain abundant radiolarians and diatoms of probable Tertiary age (table 2). South of the Martin fault, this unit also includes minor pillow basalt and abundant volcanic breccia. The rocks are altered to a bright orange-weathering gossan and are intruded by numerous porphyritic dikes for a distance of 10 mi along the south side of the Martin fault.","Diatoms: Arachinodiscus cf., A. ehrenbergii, Trinacria ef., T. pileclus Silicoflagellates: ?Corbisema geometrica, ?Corbisema hastata, ?Corbisema triacontha, Dictyocha aspera, Navoculopgis constricta",,CV002,272,Cordova,Sedimentary,953,, Tf,Lava flows,"Tertiary, middle to late?",Andesitic to basaltic lavas and associated pyroclastic rocks.,,,KN005,512,Kenai,Igneous,1000,,,2750 Td,"Intermediate, felsic and mafic dikes",early Tertiary,"Dikes of dacite, rhyolite, andesite, and rare basalt; stored in coverage as arcs, arc-code = 50, arc-para1 = 0",,Ar-AR isochron(?) age on andesite(?) of 57.0 Ma,SV002,0,Seldovia,Igneous,1011,,, Td,Dacite of Cape Saint Elias,"Tertiary, Miocene","Described by Winkler and Plafker (1981, p. 18) as follows: ""A prominent, very pale gray dacite plug complex forms the landmarks of Cape Saint Elias and Pinnacle Rock at the seward end of Kayak Island (Plafker, 1974). The dacite is very dense and hard, and is conspicuously jointed. It has a microgranitic and porphyritic texture, and consists of about 35 percent plagioclase, 35 percent quartz, 25 percent orthoclase, and 5 percent relict brown hornblende and biotite. The dacite has sharp, nearly vertical contacts with adjacent dark-gray argillaceous rocks of the Yakataga and upper Poul Creek Formations..."". A zone of hornfels at least 300 ft wide borders the body.",,K-Ar date on dacite of 6.2 + or - 0.3 Ma.,MI002,405,Middleton Island,Igneous,1053,,, Td,Dacite of Cape Saint Elias,"Tertiary, Pliocene or Miocene",Prominent very pale gray dacite plug complex that forms Cape Saint Elias and Pinnacle Rock at southwestern end of Kayak Island. Dacite is very dense and hard and is conspicuously jointed. Microgranitic and porphyritic texture.,,Whole-rock K-Ar age of 6.2 Ma,CV003,200,Cordova,Igneous,1053,,, Td,Dacite of Cape Saint Elias,"Tertiary, Pliocene or Miocene",Prominent very pale gray dacite plug complex that forms Cape Saint Elias and Pinnacle Rock at southwestern end of Kayak Island. Dacite is very dense and hard and is conspicuously jointed. Microgranitic and porphyritic texture.,,Whole-rock K-Ar age of 6.2 Ma,MI003,200,Cordova,Igneous,1053,,, Tpv,"Poul Creek Formation -- Volcanic rocks, undivided","Tertiary, Miocene, Oligocene, and Eocene","Basaltic pyroclastic and flow rocks including minor pillowed flows; locally interbedded with marine sedimentary rocks, including tuffaceous or glauconitic strata, probably genetically related to mafic dikes, sills, and plugs of the mafic plugs unit (Tm)",,K/Ar date on whole rock of 31.2 + or - 1.3 Ma,MI002,320,Middleton Island,Igneous,1080,,, Tpv,"Poul Creek Formation: Volcanic rocks, undivided","Tertiary, Miocene to Eocene","Basaltic pyroclastic and flow rocks; locally interbedded with marine sedimentary rocks. Probably related genetically to mafic dikes, sills and plugs unit (Tm).",,,CV003,320,Cordova,Igneous,1080,,, Tpv,"Poul Creek Formation: Volcanic rocks, undivided","Tertiary, Miocene, Oligocene, and Eocene","Basaltic pyroclastic and flow rocks including minor pillowed flows; locally interbedded with marine sedimentary rocks, including tuffaceous or glauconitic strata, probably genetically related to mafic dikes, sills, and plugs of the mafic plugs unit (Tm).",,K/Ar date on whole rock of 31.2 + or - 1.3 Ma,CV002,20,Cordova,Igneous,1080,,, Tm,"Mafic dikes, sills, and plugs","Tertiary, Oligocene","Mafic dikes, sills, and plugs. Strongly altered intrusions of diabase, alkalic basalt, olivine basalt, and lamprophyre. Probably related genetically to extrusive volcanic rocks (Tpv) in Poul Creek Fm.",,,CV003,423,Cordova,Igneous,1090,,, Tm,Mafic plugs,"Tertiary, Oligocene (?)",Only includes mafic plugs in the eastern Cordova quadrangle west of Nichawak Mountain; mainly in the Blying Sound quadrangle. Miller (1975) and Winkler and Plafker (1981) described the mafic plugs as coarse grained and diabasic with 45 percent euhedral plagioclase intergrown with 30 percent anhedral augite and enstatite. The remainder of the rock is composed of 5 percent opaque minerals and 20 percent secondary chlorite. ,,,CV002,42,Cordova,Igneous,1090,,, Tm,Mafic plugs,"Tertiary, Oligocene (?)",Only includes mafic plugs in the eastern Cordova quadrangle west of Nichawak Mountain mainly in the Blying Sound quadrangle. Miller (1975) and Winkler and Plafker (1981) described the mafic plugs as coarse grained and diabasic with 45 percent euhedral plagioclase intergrown with 30 percent anhedral augite and enstatite. The remainder of the rock is composed of 5 percent opaque minerals and 20 percent secondary chlorite. ,,,CV002,423,Cordova,Igneous,1090,,, Tog,"Orca Group: Greenstone, undivided","Tertiary, Paleocene and early Eocene (?)","Probably pillow basalt, basaltic tuff, and sills. Few small areas of mafic igneous rock were also included in this map unit because classification of rocks is uncertain; they include an outcrop on Outpost Island not visited by authors, rocks with uncertain contact relation near Whidbey, Johnstone, and Jackpot Bays, and sheared greenstone along Johnstone Bay fault",,,BS004,27,Blying Sound,Metamorphic,1135,,, Tog,"Orca Group: Greenstone, undivided","Tertiary, Paleocene and early Eocene (?)","Probably pillow basalt, basaltic tuff, and sills. Few small areas of mafic igneous rock were also included in this map unit because classification of rocks is uncertain; they include an outcrop on Outpost Island not visited by authors, rocks with uncertain contact relation near Whidbey, Johnstone, and Jackpot Bays, and sheared greenstone along Johnstone Bay fault",,,SR004,27,Seward,Metamorphic,1135,,, Tov,"Orca Group: Volcanic rocks, undivided","Tertiary, Eocene (?) and Paleocene","Mostly tabular or lenticular bodies of mafic volcanic rocks altered to greenstone and not examined in detail. As mapped, may include pillowed or massive flows, broken pillow breccia, tuff, and dikes.",,,SR002,333,Seward,Igneous,1135,,, Tov,"Orca Group: Volcanic rocks, undivided","Tertiary, Eocene and Paleocene","Thick and thin tabular bodies of altered tholeiitic basalt. Pillowed, massive or crudely columnar flows; pillow breccia, aquagene tuff, and diabase or gabbro sills. Local interbedding of mudstone and siltstone. Metamorphosed to zeolite or prehnite-pumpellyite facies.",,,CV003,333,Cordova,Igneous,1135,,, Tov,"Orca Group: Volcanic rocks, undivided","Tertiary, Eocene (?) and Paleocene","Mostly tabular or lenticular bodies of mafic volcanic rocks altered to greenstone and not examined in detail. As mapped, may include pillowed or massive flows, broken pillow breccia, tuff, and dikes.",,,CV002,33,Cordova,Igneous,1135,,, Top,Orca Group: Pillow basalt,"Tertiary, Paleocene and early Eocene (?)","Pale- to dark-green aphyric to porphyritic, commonly amygdaloidal, pillow basalt composed of plagioclase and clinopyroxene; plagioclase is generally replaced by albite and(or) chloritie; vesticles mostly filled with chlorite; pillow basalt in some areas grades into subordinate pillow breccia and tuff.",,,BS004,17,Blying Sound,Igneous,1136 Kvp,Valdez Group: Pillow basalt,Late Cretaceous,"Pale- to dark-green aphyric to porphyritic, frequently amygdaloidal, pillow basalt composed to plagioclase and clinopyroxene; plagioclase commonly replaced by albite and epidote, and clinopyroxene by hornblende, actinolite, and(or) chlorite; vesticles mostly filled with chlorite; pillow basalt in some areas is interlayered with subordinate pillow breccia and tuff.",,,BS004,33,Blying Sound,Igneous,1136 Top,Orca Group: Pillow basalt,"Tertiary, Paleocene and early Eocene (?)","Pale- to dark-green aphyric to porphyritic, commonly amygdaloidal, pillow basalt composed of plagioclase and clinopyroxene; plagioclase is generally replaced by albite and(or) chloritie; vesticles mostly filled with chlorite; pillow basalt in some areas grades into subordinate pillow breccia and tuff.",,,SR004,17,Seward,Igneous,1136 Kvp,Valdez Group: Pillow basalt,Late Cretaceous,"Pale- to dark-green aphyric to porphyritic, frequently amygdaloidal, pillow basalt composed to plagioclase and clinopyroxene; plagioclase commonly replaced by albite and epidote, and clinopyroxene by hornblende, actinolite, and(or) chlorite; vesticles mostly filled with chlorite; pillow basalt in some areas is interlayered with subordinate pillow breccia and tuff.",,,SR004,33,Seward,Igneous,1136 Top,Orca Group: Pillow basalt,"Tertiary, Eocene (?) and Paleocene","Pillow breccia and massive flows are subordinate in quantity to pillow basalt. Minor intercalated sedimentary rocks are predominantly siliceous mudstone and argillite. Interpillow material consists of silicious mudstone, sandstone, or carbonate rocks. Pillow basalts are porphyritic and have phenocrysts of plagioclase and clinopyroxene; olivine is present but not abundant. Altered brown-colored volcanic glass makes up much of the matrix especially in the outer parts of pillows. Vesticles are usually filled with calcite and (or) chlorite. This unit is gradational into sheeted dikes on Glacier and Knight Islands and into mixed sedimentary and volcanic rocks elsewhere.",,,BS002,330,Blying Sound,Igneous,1136 Top,Orca Group: Pillow basalt,"Tertiary, Eocene (?) and Paleocene","Pillow breccia and massive flows are subordinate in quantity to pillow basalt. Minor intercalated sedimentary rocks are predominantly siliceous mudstone and argillite. Interpillow material consists of silicious mudstone, sandstone, or carbonate rocks. Pillow basalts are porphyritic and have phenocrysts of plagioclase and clinopyroxene; olivine is present but not abundant. Altered brown-colored volcanic glass makes up much of the matrix especially in the outer parts of pillows. Vesticles are usually filled with calcite and (or) chlorite. This unit is gradational into sheeted dikes on Glacier and Knight Islands and into mixed sedimentary and volcanic rocks elsewhere.",,,SR002,330,Seward,Igneous,1136 Kvp,Valdez Group: Pillow basalt,Late Cretaceous,Pillow basalt and lesser massive basalt and broken pillow breccia make up most of the western flank of the mafic complex on the Resurrection Peninsula. These pillow basalts from a west-dipping sequence and contain minor amounts of interbedded siliceous siltstone. This unit is remarkably similar to the pillow basalt unit of the Orca Group exposed on Knight Island. Discrete pillows average 2 ft in diameter and are metamorphosed to the lowest greenschist facies.,,,BS002,612,Blying Sound,Igneous,1136 Top,Orca Group: Pillow basalt,"Tertiary, Eocene (?) and Paleocene","Pillow breccia and massive flows are subordinate in quantity to pillow basalt. Minor intercalated sedimentary rocks are predominantly siliceous mudstone and argillite. Interpillow material consists of silicious mudstone, sandstone, or carbonate rocks. Pillow basalts are porphyritic and have phenocrysts of plagioclase and clinopyroxene; olivine is present but not abundant. Altered brown-colored volcanic glass makes up much of the matrix especially in the outer parts of pillows. Vesticles are usually filled with calcite and (or) chlorite. This unit is gradational into sheeted dikes on Glacier and Knight Islands and into mixed sedimentary and volcanic rocks elsewhere.",,,CV002,330,Cordova,Igneous,1136 Top,Ophiolite of Glacier Island - Pillow basalt,"Tertiary, Eocene (?) and Paleocene (added)","Dark gray or green pillow basalt flows and minor massive basalt flows. Basalts are fine to medium grained, porphyritic with phenocrysts of plagioclase and clinopyroxene; olivine is present but not abundant. Pillows average 0.3 m in diameter. Altered brown volcanic glass makes up much of the inter-pillow matrix. Vesicles are usually filled with calcite and/or chlorite. This unit is gradational into sheeted dike unit",,,SR005,3123,Seward,Igneous,1136 Kvd,Valdez Group: Sheeted basalt dikes,Late Cretaceous,"Dark-green, gray, and brown aphyric to porphyritic and locally gabbroic dikes composed mainly of plagioclase and clinopyroxene; olivine present in a few dikes; plagioclase generally is replaced by albite, and clinopyroxene commonly replaced by hornblende with fringes of actinolite; olivine partly altered to serpentine; fine-grained basalt is commonly altered to an aggregate of chlorite, epidote, and actinolite; gabbroic dikes contain a few percent opaque minerals; Sheeted basalt dikes",,,BS004,35,Blying Sound,Igneous,1137 Tod,Orca Group: Sheeted basalt dikes,"Tertiary, Paleocene and early Eocene (?)","Dark-green, gray, and brown aphyric to porphyritic and gabbroic dikes composed mainly of plagioclase and clinopyroxene; plagioclase and clinopyroxene; felsic plagioclase-quartz dikes occur locally; plagioclase-clinopyroxene-olivine dikes are present but not common; plagioclase generally is replaced by albite; clinopyroxene largely is replaced by hornblende with fringes of actinolite; olivine is partly altered to serpentine; fine-grained basalt is commonly altered to an aggregate of chlorite, epidote, and actinolite; gabbroic dikes contain a few percent of opaque minerals",,,SR004,21,Seward,Igneous,1137 Kvd,Valdez Group: Sheeted basalt dikes,Late Cretaceous,"Dark-green, gray, and brown aphyric to porphyritic and locally gabbroic dikes composed mainly of plagioclase and clinopyroxene; olivine present in a few dikes; plagioclase generally is replaced by albite, and clinopyroxene commonly replaced by hornblende with fringes of actinolite; olivine partly altered to serpentine; fine-grained basalt is commonly altered to an aggregate of chlorite, epidote, and actinolite; gabbroic dikes contain a few percent opaque minerals; Sheeted basalt dikes",,,SR004,35,Seward,Igneous,1137 Tod,Orca Group: Sheeted dikes,"Tertiary, Eocene (?) and Paleocene","ORCA GROUP: Mafic sheeted-dike complexes in the Orca Group occur on Knight and Glacier Islands. The dikes are basaltic in composition and display diabasic, equigranular, and porphyritic textures. Phenocrysts of plagioclase and clinopyroxene are common. Small irregular pods, veins, and dikes of plagiogranite were observed in the dike complex north of Bay of Isles on Knight Island. Also on Knight Island, numerous major and minor shear zones consist of chlorite schist, tuffaceous rocks, and sheared pillow basalt and are commonly cut by unsheared mafic dikes. This unit is metamorphosed to greenschist facies locally on Knight Island.",,,SR002,334,Seward,Igneous,1137 Kvd,Valdez Group: Sheeted dikes,Late Cretaceous,"Mafic sheeted dikes forming the topographically rugged crest of the Resurrection Peninsula are similar to the sheeted dikes unit of the Orca Group on Knight Island. Most dikes are 3 to 6 ft thick, vertical, and generally have a parallel north-south orientation. Locally cross-cutting dikes intrude preexisting dikes at low angles. Aphanitic, porphyritic, and diabasic textures are common even across one outcrop. Weathering color varies from buff to dark gray to dark green and along with the textural variations suggest slightly differing compositions and (or) cooling rates. The sheeted dikes grade westward into pillow basalt and eastward into gabbro.",,,BS002,613,Blying Sound,Igneous,1137 Kvd,Valdez Group: Sheeted dikes,Late Cretaceous,"Mafic sheeted dikes forming the topographically rugged crest of the Resurrection Peninsula are similar to the sheeted dikes unit of the Orca Group on Knight Island. Most dikes are 3 to 6 ft thick, vertical, and generally have a parallel north-south orientation. Locally cross-cutting dikes intrude preexisting dikes at low angles. Aphanitic, porphyritic, and diabasic textures are common even across one outcrop. Weathering color varies from buff to dark gray to dark green and along with the textural variations suggest slightly differing compositions and (or) cooling rates. The sheeted dikes grade westward into pillow basalt and eastward into gabbro.",,,SR002,613,Seward,Igneous,1137 Tod,Ophiolite of Glacier Island - Sheeted dikes,"Tertiary, Eocene (?) and Paleocene (added)","Mafic sheeted dikes are basaltic in composition and form the lower oceanic-crust part of the ophiolite of Glacier Island. The dikes are diabasic, equigranular, and porphyritic. Phenocrysts of plagioclase and clinopyroxene are common. Facings on chilled margins and other field observations indicate that the dikes were intruded into, between, and across pre-existing dikes. Most dikes are vertical in orientation. The chemistry from typical mid-ocean ridge basalt (Crowe and others, 1992) and the ophiolite is part of a 80 km long belt of ophiolitic rocks that starts at Elrington Island to the south and includes Knight Island, Glacier Island, and the Ellamar area",,"37.6Ma ñ0.6, plag, plateau age",SR005,3128,Seward,Igneous,1137 Ti,Intrusive rocks,Tertiary,"Dikes, sills, and stock-lke masses of felsic to mafic composition",,,KN002,1200,Kenai,Igneous,1200 Tgc,Cedar Bay granite,"Tertiary, Eocene (?)","Light-gray and pink medium- and coarse-grained muscovite (biotite) granite; plagioclase ranges from oligoclase to andesine in composition, and biotite is commonly less than 1 percent.",,,SR004,9,Seward,Igneous,1270 Tg,Granite and granodiorite,"Tertiary, Oligocene","The central part of the plutons are dominantly light-gray, medium- to coarse-grained granite with color index ranging from 3 to 8. The plutons grade outward to fine- to medium-grained, more mafic mineral-rich (color indices of 10 to 20) margins of granitic, granodioritic, and sometimes tonalitic compositions. Hypidiomorphic-granular texture is most common, but equigranular as well as porphyritic varieties also exist. Primary biotite is the most abundant mafic mineral and is sometimes accompanied by hornblende. Towards the pluton margins, however, hornblende comonly dominates over biotite. Optically determined plagioclase compositions range from oligoclase to andesine for all rocks of this unit. ",,K/Ar dates from 34.2 + or - 1.7 to 36.2 + or - 1 Ma.,SR002,420,Seward,Igneous,1270 Tg,Leucocratic Granite,Oligocene,"Light colored, leucocratic biotite granite. Color index 5. Common textures are allotriomorphic granular and hypidiomorphic granular. Comprises several igneous bodies - plutons of Cedar Bay, Terentiev Lake, Granite Cove, and Columbia Glacier stock and an unnamed elongate body northeast of Miners Lake. Also associated with pluton of Miners Bay. Correlated with other 34-Ma plutons in Prince William Sound, however, is more leucocratic and contains greater amounts of silica and alkalis",,"Ar/Ar 25.4 ñ0.1 Ma, kspar, plateau age; 29.2 ñ0.3 Ma, microcline, isochron age; 31.7 ñ0.1 Ma, kspar, plateau age; 29.2 ñ0.1 Ma, kspar, plateau age",SR005,3119,Seward,Igneous,1270 Tg,Granodiorite and granite,"Tertiary, Oligocene","Light-gray medium- to coarse-grained biotite (hornblende) granodiorite and granite stocks of central part of map area; larger stocks commonly grade from marginal zones containing more biotite (and locally hornblende) inward to more leucocratic zones; large parts of intrusions are porphyritic and contain orthoclase phenocrysts in a medium-grained groundmass; plagioclase ranges from oligoclase to andesine in composition, and biotite constitutes between 5 and 15 percent; Granodiorite and granite",,"K/Ar dates on biotite of about 36.6 m.y., 35.5, 36.1, and 36.2 Ma; K/Ar date on hornblende of about 34.4 Ma.",SR004,5,Seward,Igneous,1273 Tgb,Gabbro,"Tertiary, Oligocene, Eocene, or Paleocene",Dark-gray fine- to medium-grained locally porphyritic gabbro composed of subequal amounts of labradorite and clinopyroxene; locally contains olivine on Esther Island; pyroxene largely altered to hornblende north of Paddy Bay.,,,SR004,7,Seward,Igneous,1294 Tgd,Gabbro and diorite,"Tertiary, Oligocene","Consists of mafic rocks belonging to one of the main intrusive events. These rocks are dominantly medium- to coarse-grained gabbro (labradorite-bearing) and subordinate diorite (andesine-bearing) with finer grained borders of quartz gabbro and quartz diorite. Most of the rocks are subophitic, some are hypidiomorphic- to allotriomorphic-granular and a few are porphyritic. The dominant mafic assemblage is clinopyroxene +/- orthopyroxene. Assemblages of primary + subsequent hornblende and hornblende +/- biotite are also found, mainly in the dioritic and quartz dioritic rocks. Rocks of this unit are considered to be an early mafic phase associated with the granitic plutons of the granite and granodiorite unit (Tg).",,K/Ar date of 36.6 +/- 1.01 Ma indicating a chronological relation to the granite and granodiorite unit (Tg).,SR002,421,Seward,Igneous,1294 Tg,Granitoid rocks,"Tertiary, Eocene","Granitoid rocks-- Biotite and biotite-hornblende granodiorite, granite, and minor tonalite; generally medium grained, hypidiomorphic, and equigranular; foliated in many places, especially near contacts with country rocks.",,K-Ar ages from 50.5 to 53.5 Ma,CV003,205,Cordova,Igneous,1300 Tgg,Granite and granodiorite,"Tertiary, Eocene",Generally medium- and medium- to coarse-grained hypidiomorphic-granular biotite granite with border phases of biotite + or - hornblende granite to granodiorite and tonalite. Plutons of this unit are generally medium- and medium- to coarse-grained hypidiomorphic-granular biotite granite with border phases of biotite + or - hornblende granite to granodiorite and tonalite. The mafic mineral content varies with composition such that the color index of the granite ranges from 5 to 10; the granodiorite color index ranges from 10 to 20; and the tonalite color index ranges from 15 to 35.,,"Six K/Ar ages on hornblende, biotite, and phlogopite ranging from 50.5 to 53.5 Ma ",CV002,440,Cordova,Igneous,1300 Tf,Felsite Dikes,Tertiary,"Includes two types: (1) leucocratic porphyry dikes with 20%-30% euhedral phenocrysts of potassium feldspar and quartz in a fine grained allotriomorphic groundmass. Intrudes only the Orca Group; (2) allotriomorphic granular, white weathering, fine grained dikes with approximately 30% quartz, 60% feldspar, and 20% altered mafic minerals. Thickness ranges from 0.3 m - 2 m. Intrudes the Orca and Valdez Group",,"Ar/Ar 38.6 ñ0.6 Ma, biotite, plateau age; 40 ñ1 Ma, biotite, disturbed, wt. avg.; 31.1 ñ 0.2 Ma, kspar, isochron age",SR005,3107,Seward,Igneous,1301 Ti3,Tonalite,Tertiary,"Mostly biotite tonalite but also includes biotite-muscovite +/- garnet tonalite and trondhjemite. Includes both weakly foliated, syn-D plutons (Ti3a) and unfoliated, post D plutons (Ti3b)",,,CV005,505,Cordova,Igneous,1310 Ti2,Tonalite ,Tertiary,Mostly hornblende-biotite tonalite but also includes biotite tonalite. Strongly foliated and lineated plutons with fabrics subparallel to D2 in adjacent metamorphic rocks,,,CV005,506,Cordova,Metamorphic,1310 Ti2,Tonalite ,Tertiary,Mostly hornblende-biotite tonalite but also includes biotite tonalite. Strongly foliated and lineated plutons with fabrics subparallel to D2 in adjacent metamorphic rocks,,,CV006,504,Cordova,Metamorphic,1310 Ti3b,Tonalite,Tertiary,"Mostly biotite tonalite, but also some biotite-muscovite +/- garnet trondhjemite and granodiorite. Unfoliated plutonic rocks",,,CV006,508,Cordova,Igneous,1310 Ti3a,Tonalite,Tertiary,"Mostly biotite tonalite, weakly foliated, syn-D plutons",,,CV006,512,Cordova,Metamorphic,1310 Tg,Granodiorite,"Tertiary, Eocene",Medium- and coarse-grained biotite granodiorite,,"U-Pb monazite age of 56.0, Ar-Ar biotite ages of 54.2, 53.2, 53.4,53.7, and 54.0",SV002,113,Seldovia,Igneous,1320 Tgh,Granite of Harding Icefield region,"Tertiary, Eocene","Medium- to dark-gray foliated amdium- to coarse-grained biotite-muscovite-(hornblende) granite and granodiorite; marginal phases are locally biotite-muscovite-(hornblende) tonalite; mafic minerals, almost wholly biotite, constitute 20 to 30 percent of minerals in tonalitic rocks, 15 to 20 percent of minerals in tonalitic rocks, 15 to 20 percent of granodiorite, and 5 to 10 percent of granite; muscovite, a late but primary mineral, commonly makes up less than 2 percent.",,K/Ar dates on biotite of about 59.2 m.y. and on muscovite of about 54.6 m.y.,BS004,11,Blying Sound,Igneous,1320 Tgh,Granite of Harding Icefield region,"Tertiary, Eocene","Medium- to dark-gray foliated medium- to coarse-grained biotite-muscovite-(hornblende) granite and granodiorite; marginal phases are locally biotite-muscovite-(hornblende) tonalite; mafic minerals, almost wholly biotite, constitute 20 to 30 percent of minerals in tonalitic rocks, 15 to 20 percent of minerals in tonalitic rocks, 15 to 20 percent of granodiorite, and 5 to 10 percent of granite; muscovite, a late but primary mineral, commonly makes up less than 2 percent.",,K/Ar dates on biotite of about 59.2 m.y. and on muscovite of about 54.6 m.y.,SR004,11,Seward,Igneous,1320 Tgg,Granite and granodiorite,"Tertiary, Eocene",Generally medium- and medium- to coarse-grained hypidiomorphic-granular biotite granite with border phases of biotite + or - hornblende granite to granodiorite and tonalite. Plutons of this unit are generally medium- and medium- to coarse-grained hypidiomorphic-granular biotite granite with border phases of biotite + or - hornblende granite to granodiorite and tonalite. The mafic mineral content varies with composition such that the color index of the granite ranges from 5 to 10; the granodiorite color index ranges from 10 to 20; and the tonalite color index ranges from 15 to 35.,,"Six K/Ar ages on hornblende, biotite, and phlogopite ranging from 50.5 to 53.5 Ma ",SR002,440,Seward,Igneous,1320 Tgh,Granodiorite,"Tertiary, Eocene",Medium- and coarse-grained biotite granodiorite of the Aialik pluton and Paguna stock -- assigned to granitic rocks of the Harding Icefield. Same as NSA 1200 of source KN003,,"U-Pb monazite age of 56.0, Ar-Ar biotite ages of 54.2, 53.2, 53.4,53.7, and 54.0",SV009,9113,Seldovia,Igneous,1320 Tgh,Granodiorite,"Tertiary, Eocene",Granitic rocks of the Harding Icefield extrapolated from description of Tysdal and Case (1979) in the adjoining Seward quadrangle. Nunataks were mapped by Magoon and others (1976) as Valdez Group.,,"U-Pb monazite age of 56.0, Ar-Ar biotite ages of 54.2, 53.2, 53.4,53.7, and 54.0",KN015,1513,Kenai,Igneous,1320 Kvg,Valdez Group: Gabbro,Late Cretaceous,"Green massive medium- to coarse-grained and locally pegmatitic gabbro composed chiefly of labradorite and clinopyroxene; commonly altered to varying degreens; pyroxene altered to green hornblende which is partly replaced by actinolite and(or) chlorite; plagioclase commonly replaced by albite and epidite group minerals, and white mica; accessory minerals include magnetite, apatite, and quartz.",,,BS004,37,Blying Sound,Igneous,1374 Togb,Orca Group: Gabbro and diorite,"Tertiary, Paleocene and early Eocene (?)",ORCA GROUP: Medium- and dark-gray to green coarse-grained chiefly clinopyroxene-plagioclase rocks with ophitic to subophitic texture and gabbroic to dioritic composition; locally pegmatitic with clinopyroxene crystals as much as 5 cm long; clinopyroxene commonly is partly replaced by uralitic amphibole and chlorite; plagioclase is partly replaced by albite; epidote and minor opaque minerals are common,,,SR004,25,Seward,Igneous,1374 Kvg,Valdez Group: Gabbro,Late Cretaceous,"Green massive medium- to coarse-grained and locally pegmatitic gabbro composed chiefly of labradorite and clinopyroxene; commonly altered to varying degreens; pyroxene altered to green hornblende which is partly replaced by actinolite and(or) chlorite; plagioclase commonly replaced by albite and epidite group minerals, and white mica; accessory minerals include magnetite, apatite, and quartz.",,,SR004,37,Seward,Igneous,1374 Togb,Orca Group: Gabbro,"Tertiary, Eocene (?) and Paleocene","ORCA GROUP: Several small intrusive bodies of gabbro occur on Knight Island. The largest body crops out east of Drier Bay, where it intrudes sheeted dikes. Other gabbro bodies that have been reported are too small to show at the scale of this map. Most of these are elongate parallel to the trend of the sheeted dikes. At the north end of Latouche Island a 100-ft-wide exposure of gabbro can be seen intruding slate and sandstone.",,,SR002,470,Seward,Igneous,1374 Kvgb,Valdez Group: Gabbro,Late Cretaceous,"Two north-south-trending plutons of medium- to coarse-grained gabbro occur east of the sheeted dikes unit on the Resurrection Peninsula. Several features are displayed in shoreline exposures of the westernmost pluton that were not observed in the easternmost pluton. Well-developed, west-dipping magmatic mineral layering was observed in shore line outcrops between Driftwood Bay and Talus Bay. Hornblende plagiogranite in a 65-ft-wide stock-work zone from the western pluton has intruded the gabbro in Killer Bay. Other small dikes and pods of plagiogranite intrude the gabbro along the west shore of Day Harbor. Mafic dikes intrude the western gabbro pluton and increase in abundance from east to west.",,,BS002,614,Blying Sound,Igneous,1374 Kvgb,Valdez Group: Gabbro,Late Cretaceous,"Two north-south-trending plutons of medium- to coarse-grained gabbro occur east of the sheeted dikes unit on the Resurrection Peninsula. Several features are displayed in shoreline exposures of the westernmost pluton that were not observed in the easternmost pluton. Well-developed, west-dipping magmatic mineral layering was observed in shore line outcrops between Driftwood Bay and Talus Bay. Hornblende plagiogranite in a 65-ft-wide stock-work zone from the western pluton has intruded the gabbro in Killer Bay. Other small dikes and pods of plagiogranite intrude the gabbro along the west shore of Day Harbor. Mafic dikes intrude the western gabbro pluton and increase in abundance from east to west.",,,SR002,614,Seward,Igneous,1374 Tou,Orca Group: Ultramafic rocks,"Tertiary, Eocene (?) and Paleocene","ORCA GROUP: Two of these peridotite bodies occur within or near major shear zones in the sheeted dikes unit; only the larger (650 by 1,300 ft body is shown in the Port Audry shear zone. The third body occurs as a xenolith in sheeted dikes. The ultramafic rocks weather orange brown in color and form subdued rubble outcrops. Minor plagioclase-bearing amphibolite is spatially associated with the peridotite from the Port Audry shear zone. ultramafic rocks",,,SR002,471,Seward,Igneous,1375 Tmu,Mafic and ultramafic plutonic rocks,"Tertiary, Eocene and Paleocene?","Mafic and ultramafic plutonic rocks-- Compositionally and texturally variable unit consists mainly of medium grained gabbro, local diabase, hornblende gabbro, peridotite, and orthopyroxenite. Gabbro is slightly to moderately foliated except near contacts with country rock.",,,CV003,210,Cordova,Igneous,1380 Kvu,Valdez Group: Ultramafic rocks,Late Cretaceous,Serpentinized peridotite and dunite occur at three localities underlain by the Valdez Group: two of these are on the Resurrection Peninsula and the third is near the head of Port Fidalgo. This description represents the third at Port Fidalgo. The third outcrop of ultramafic rocks is northeast of the head of Port Fidalgo. This outcrop consists of both banded and massive dark- to light-green serpentized dunite and peridotite. The strongly shared margins suggest that these rocks have been tectonically emplaced,,,CV002,5533,Cordova,Igneous,1380 TKu,"Plutonic rocks, undivided",Tertiary and Cretaceous,Plutonic rocks,,,KN012,1203,Kenai,Igneous,1650 TKgd,"Granodiorite, quartz diorite, and diorite",Tertiary or late Cretaceous,,,,KN002,2905,Kenai,Igneous,1660 Kk,"Kaguyak Formation, nonmarine sedimentary rocks",Late Cretaceous,"Sandstone, conglomerate, siltstone and interbedded coal","(Not in Bradley, but cited in Magoon and others, 1980): Sporomorphs: Cranwellia striata Srivastava, Balmeisporites spp., Wodehouseia spinata Stanley, Proteacidites spp., Aquilapollenites bertillonites Funkhouser, A. reticulatus Mtchedlishvili, A delicatus Stanley",,SV002,72,Seldovia,Sedimentary,1961 KPm,"McHugh Complex, undivided",Cretaceous to Permian,"Complexly deformed tectonic assemblage of diverse lithologies (melange). Lithologies include argillite, tuff, graywacke, basalt, chert, outcrop-scale melange, conglomerate, gabbro, and limestone. Rocks typically show prehnite-pumpellyite facies metamorphism.",Permian conodonts and fusilinids.,,SV002,77,Seldovia,Tectonite,2190 KJm,McHugh Complex,Cretaceous and (or) Jurassic,"Weakly metamorphosed siltstone, graywacke, arkose, and conglomeratic sandstone; greenstone (mostly basaltic), metachert, and argillite",,,KN003,2190,Kenai,Tectonite,2190 KJm,McHugh Complex,Cretaceous and (or) Late Jurassic,"Between Border Ranges fault and unnamed fault: melange of siltstone, sandstone, mud-chip sandstone, conglomeratic sandstone, tuff, and less abundant gabbro, serpentinite, bedded chert, and pillow basalt; fine-grained sedimentary strata commonly streaked out sedimentary and igneous rocks are broken and discontinuous; metamorphic minerals include muscovite, epidote, calcite, chlorite, albite, and veinlets of prehnite.",,,SR004,43,Seward,Sedimentary,2190 KJm?,McHugh Complex,Late Jurassic and (or) Cretaceous,"Between unnamed fault and Eagle River thrust fault (?): massive sandstone that is brown, tan, and gray-green thick-bedded ridge-forming medium- and coarse-grained locally conglomeratic sandstone; abundantmud chips give rock a distinct spotted appearance; sand grains are quartz, plagioclase, basalt fragments, sandstone fragments, clinopyroxene, granitic rock, chert, and basalt; unit locally contains thin beds of chert and siltstone; metamorphism of unit has produced albite, epidote, calcite, and chlorite; prehnite forms veins in some rocks.",,,SR004,44,Seward,Tectonite,2190 Km,McHugh Complex,Early Cretaceous,"Description from Clark (1981, p. 3-4) ""The McHugh Complex is a heterogeneous, chaotic assemblage that includes metamorphosed clastic and volcanic rocks of diverse ages. The clastic rocks, which are the most abundant, comprise thick, fault-bounded sequences of weakly metamorphosed graywacke, arkose, siltstone, and conglomeratic sandstone. Bedding is rarely seen and commonly discontinuous. The volcanic portion of the McHugh Complex is composed of greenstones, mostly of basaltic composition, that are associated with radiolarian metacherts, siltite, and argillite***. The volcanic rocks are thought to represent oceanic crust. The clastic sediments are thought to have been deposited in an ocean trench. NOTE: See pamphlet for more detail.",,,SR002,650,Seward,Tectonite,2190 Ju,Interstratified graywacke-argillite and volcanic rocks,Jurassic?,Interstratified graywacke-argillite and volcanic rocks. Highly folded and fractured. Exposed at surface or beneath thin discontinuous deposits of Quaternary age,,,KN013,302,Kenai,Tectonite,2190 KPms,"McHugh Complex, graywacke and conglomerate",Early Cretaceous to Early Jurassic (Pliensbachian),Fault-bounded slices of massive conglomerate and graywacke.,Pliensbachian radiolaria in underlying ribbon chert,,SV002,75,Seldovia,Sedimentary,2198 KPmc,"McHugh Complex, basalt and chert",Early Cretaceous (Albian) to Middle Triassic (Ladinian),"Pillow and massive basalt, depositionally overlain by radiolarian chert.",Cretaceous to Triassic radiolaria in bedded chert,,SV002,74,Seldovia,Tectonite,2199 Kd,Intermediate dike,Early Cretaceous,"Basalt-andesite dike intruding McHugh Complex. Stored in coverage as arcs, arc-code = 50 and arc-para1 = 5",,Ar-Ar hornblende plateau age of 115 Ma,SV002,0,Seldovia,Igneous,2401 Ku,"Plutonic rocks, undivided",Late Cretaceous,"Plutonic rocks, undivided",,,KN009,902,Kenai,Igneous,2410 Ki12,Cretaceous intrusive rocks -- Unit 12 Quartz diorite,Cretaceous,"Locally foliated, seriate hornblende-biotite quartz diorite. Biotite-hornblende rationis quite variable although color index remains constant. Deuteric epidote common. Extension from adjacent Lake Clark quadrangle",,,KN008,172,Kenai,Igneous,2430 Kv,Valdez Group,Late Cretaceous,"Thick sequences of drab, rythmically alternating multiply deformed turbidites, including metasandstone, metasiltstone, argillite, slate, and phyllite, and rare beds of pebbly argillite and metasandstone; generally beds are a few centimeters to a few meters thick, but locally massive metasandstone is as thick as several tens of meters. In some places, primary sedimentary structures such as graded bedding, current-ripple cross-lamination, convolute bedding, and sole markings are preserved.",Maestrichtian and Campanian(?) Inoceramus,,SV002,71,Seldovia,Metamorphic,2700 KJv,Valdez Group (?),Cretaceous and Jurassic (?),"Metawacke, metasiltstone, and argillite; locally phyllitic",,,KN003,2700,Kenai,Metamorphic,2700 Kv,"Valdez Group: Sedimentary rocks, undivided",Late Cretaceous,"Dark-gray thin- to thick-bedded sandstone, siltstone, and mudstone flysch; sandstone is fine to coarse grained and mainly is composed of plagioclase, quartz, and igneous rock fragments, the third ranging from a few percent to as much as 40 percent of rock; conglomeratic sandstone with clasts of sedimentary rocks are widely distributed, occurring at base of some sandstone beds; congloverate composed of well-rounded pebbles and cobbles of felsic porphyry was observed in a few places; dense limestone concretions occur locally; unit is metamorphosed largely to chlorite zone of greenschist facies; Sedimentary rocks, undivided",Mollusc. Inoceramus kusiroensis Maestrichtian Late Cretaceou ),,BS004,29,Blying Sound,Sedimentary,2700 Kv,"Valdez Group: Sedimentary rocks, undivided",Late Cretaceous,"Dark-gray thin- to thick-bedded sandstone, siltstone, and mudstone flysch; sandstone is fine to coarse grained and mainly is composed of plagioclase, quartz, and igneous rock fragments, the third ranging from a few percent to as much as 40 percent of rock; conglomeratic sandstone with clasts of sedimentary rocks are widely distributed, occurring at base of some sandstone beds; congloverate composed of well-rounded pebbles and cobbles of felsic porphyry was observed in a few places; dense limestone concretions occur locally; unit is metamorphosed largely to chlorite zone of greenschist facies; Sedimentary rocks, undivided",Mollusc. Inoceramus kusiroensis Maestrichtian Late Cretaceou ),,SR004,29,Seward,Sedimentary,2700 Kvs,"Valdez Group: Sedimentary rocks, undivided",Late Cretaceous,"Thick sequences of deformed and metamorphosed flysch consisting of metasandstone, metasiltstone, argillite, slate, and phyllite, with rare beds of conglomerate and pebbly argillite. In many places primary internal sedimentary structures, consisting of graded bedding, cross laminations, and convolute bedding are preserved. All sedimentary rocks studied contain metamorphic biotite. The sandstones display a moderately developed semischistose texture that has abundant randomly oriented interstitial biotite and less abundant weakly aligned biotite. Sandstones range from lithic to feldspatholithic in composition. Samples become less lithic-rich and more feldspar- and quartz-rich from west to east.","Pelecypod: Inoceramus kusiroensis, Inoceramus ulrichi, and Inoceramya concentrica",K/Ar date on biotite semischist of 51.5 + or - 1.5 Ma,SR002,510,Seward,Sedimentary,2700 Kvs,"Valdez Group: Metasedimentary rocks, undivided",Late Cretaceous,"Thick sequence of rhythmically alternating, multiply-deformed, metamorphosed turbidites that consist of metasandstone, metasiltstone, argillite, slate and phyllite and rare beds of pebbly argillite. Beds generally a few centimeters to a few meters thick. Primary internal sedimentary structures are common. Variably metamorphosed regionally from zeolite to lower greenschist facies.",,,CV003,511,Cordova,Metamorphic,2700 Kvs,"Valdez Group: Sedimentary rocks, undivided",Late Cretaceous,"Thick sequences of deformed and metamorphosed flysch consisting of metasandstone, metasiltstone, argillite, slate, and phyllite, with rare beds of conglomerate and pebbly argillite. In many places primary internal sedimentary structures, consisting of graded bedding, cross laminations, and convolute bedding are preserved. All sedimentary rocks studied contain metamorphic biotite. The sandstones display a moderately developed semischistose texture that has abundant randomly oriented interstitial biotite and less abundant weakly aligned biotite. Sandstones range from lithic to feldspatholithic in composition. Samples become less lithic-rich and more feldspar- and quartz-rich from west to east.","Pelecypod: Inoceramus kusiroensis, Inoceramus ulrichi, and Inoceramya concentrica",K/Ar date on biotite semischist of 51.5 + or - 1.5 Ma,CV002,510,Cordova,Sedimentary,2700 Ku,Graywacke-argillite and other consolidated rocks,Cretaceous,Graywacke-argillite and other consolidated rocks. Highly folded and fractured. Exposed at surface or beneath thin discontinuous deposits of Quaternary age,,,KN013,301,Kenai,Sedimentary,2700 Ku,Graywacke-argillite and other consolidated rocks,Cretaceous,Graywacke-argillite and other consolidated rocks. Highly folded and fractured. Exposed at surface or beneath thin discontinuous deposits of Quaternary age,,,SV007,301,Seldovia,Sedimentary,2700 Kvvs,Valdez Group: Interbedded volcanic and sedimentary rocks,Late Cretaceous,"This unit is composed of approximately equal amounts of interbedded volcanic rocks, consisting of volcanic breccia, tuff, tuffaceous sediment, and minor pillow basalt, and sedimentary rocks, consisting of sandstone, siltstone, shale, and chert. The two exposures of the unit differ in character. In the Cordova quadrangle the unit tends to weather orange and includes more sedimentary rocks (including marble) than on the Resurrection Peninsula. Near the head of Port Fidalgo this unit has been metamorphosed to amphibote-bearing greenschist.",,"K-Ar date on amphibote-bearing greenschist of 47.6 + or - 1.4 Ma was reported, those source rocks are now assigned to Orca Group",SR002,554,Seward,Igneous,2702 Kvvs,Valdez Group: Interbedded metavolcanic and metasedimentary rocks,Late Cretaceous,"Equal proportions of interbedded metavolcanic and metasedimentary rocks. Metavolcanic--semischistose metatuff and breccia and minor pillow basalt. Metasedimentary--slate, phyllite, with metasilstone and metasandstone interbedding. Variable metamorphic grades.",,,CV003,555,Cordova,Metamorphic,2702 Kvvs,Valdez Group: Interbedded volcanic and sedimentary rocks,Late Cretaceous,"This unit is composed of approximately equal amounts of interbedded volcanic rocks, consisting of volcanic breccia, tuff, tuffaceous sediment, and minor pillow basalt, and sedimentary rocks, consisting of sandstone, siltstone, shale, and chert. The two exposures of the unit differ in character. In the Cordova quadrangle the unit tends to weather orange and includes more sedimentary rocks (including marble) than on the Resurrection Peninsula. Near the head of Port Fidalgo this unit has been metamorphosed to amphibote-bearing greenschist.",,"K-Ar date on amphibote-bearing greenschist of 47.6 +/- 1.4 Ma was reported, those source rocks are now assigned to Orca Group",CV002,554,Cordova,Igneous,2702 Kvv,"Valdez Group: Metavolcanic rocks, undivided",Late Cretaceous,"Tholeiitic metabasalt and basaltic metatuff, including local pillow lava, pillow breccia, and gabbroic dikes and sills. Metabasalt forms rugged, nearly massive outcrops, whereas semischistose metatuff forms more subdued outcrops. Variable metamorphic grades.",,,CV003,515,Cordova,Metamorphic,2705 Kvgr,Valdez Group: Greenstone,Late Cretaceous,"This unit consists of massive greenstone, metamorphosed pillow basalt, and mafic dikes exposed near the heads of Woodworth and Schwan Glaciers. Elsewhere in the Cordova and Valdez quadrangles, the unit includes lenticular bodies of chorite schist that may have originally typically metamorphosed to greenschist and low amphibolite facies. The higher grade facies is distinguished by the presence of dark-green hornblende.",,,CV002,611,Cordova,Metamorphic,2705 Kvt,Tuff,Late Cretaceous,"Green to dark-gray fine-grained finely laminated tuff with plagioclase phenocrysts; metamorphosed to chlorite and biotite zones of greenschist facies; chlorite, epidote, and locally actinolite are abundant; remnants of glossy shards are present.",,,BS004,31,Blying Sound,Igneous,2706 Kvt,Tuff,Late Cretaceous,"Green to dark-gray fine-grained finely laminated tuff with plagioclase phenocrysts; metamorphosed to chlorite and biotite zones of greenschist facies; chlorite, epidote, and locally actinolite are abundant; remnants of glossy shards are present.",,,SR004,31,Seward,Igneous,2706 Kvu,Valdez Group: Ultramafic rocks,Late Cretaceous,"Dunite, locally with layers of chromite, moderately to mostly altered to serpentine, serpentine-talc, and talc schist; lustrous pale- to dark-green and black, locally reddish weathering rock that forms dike-like and irregularly shaped intrusive bodies",,,SR004,39,Seward,Igneous,1375 Kvu,Valdez Group: Ultramafic rocks,Late Cretaceous,Serpentinized peridotite and dunite occur at three localities underlain by the Valdez Group: two of these are on the Resurrection Peninsula and the third is near the head of Port Fidalgo. On the Resurrection Peninsula small sparse inclusions of altered dunite are found in the gabbro unit. Blocks of serpentinite and serpentinized peridotite crop out within the interbedded volcanic and sedimentary rocks unit. Their strongly shared margins suggest that these rocks have been tectonically emplaced. The third outcrop of ultramafic rocks is northeast of the head of Port Fidalgo. This outcrop consists of both banded and massive dark- to light-green serpentized dunite and peridotite,,,SR002,553,Seward,Igneous,1375 Kvu,Valdez Group: Ultramafic rocks,Late Cretaceous,Serpentinized peridotite and dunite occur at three localities underlain by the Valdez Group: two of these are on the Resurrection Peninsula and the third is near the head of Port Fidalgo. This description reflects the two localities on the Resurrection Peninsula. On the Resurrection Peninsula small sparse inclusions of altered dunite are found in the gabbro unit. Blocks of serpentinite and serpentinized peridotite crop out within the interbedded volcanic and sedimentary rocks unit. Their strongly shared margins suggest that these rocks have been tectonically emplaced,,,CV002,553,Cordova,Igneous,1375 Kvm,Melange of Iceworm Peak,Late Cretaceous,Tectonic melange consisting of blocks of graywacke in a phacoidally cleaved matrix of slate having a Valdez Group protolith for both matrix and blocks.,,,SV002,1071,Seldovia,Tectonite,2708 Kvm,Melange of Iceworm Peak,Late Cretaceous,Tectonic melange consisting of blocks of graywacke in a phacoidally cleaved matrix of slate having a Valdez Group protolith for both matrix and blocks.,,,KN003,3708,Kenai,Tectonite,2708 Kvs,"Schist, Valdez Group",Late Cretaceous,"Schistose, interbedded siltstone, graywacke, and less abundant tuff, tufaceous sandstone, and basalt (pillow basalt?); igneous rocks are typically dark green, metasiltstone is shiny steel gray, and metasandstone is dark gray; metamorphosed chiefly to biotite zone of greenschist facies, but locally to chlorite zone; typical metamorphic mineral assemblages of biotite zone are biotite-muscovite-chlorite-quartz-epidote-calcite-albite; actinolite is present in some metavolcanic rocks; chlorite zone assemplages are similar but lack biotite",,,BS004,41,Blying Sound,Metamorphic,2710 Kvs,"Schist, Valdez Group",Late Cretaceous,"Schistose, interbedded siltstone, graywacke, and less abundant tuff, tufaceous sandstone, and basalt (pillow basalt?); igneous rocks are typically dark green, metasiltstone is shiny steel gray, and metasandstone is dark gray; metamorphosed chiefly to biotite zone of greenschist facies, but locally to chlorite zone; typical metamorphic mineral assemblages of biotite zone are biotite-muscovite-chlorite-quartz-epidote-calcite-albite; actinolite is present in some metavolcanic rocks; chlorite zone assemplages are similar but lack biotite",,,SR004,41,Seward,Metamorphic,2710 Kvm,Valdez Group: Schist,Late Cretaceous,Homogenous pelitic schist and minor amphibolite; includes spotted biotite-plagioclase-quartz schist. Common banding probably represents original layering. Transitional into gneissose rocks to the east and into greenschist-facies rocks of metasedimentary rocks to the west.,,,CV003,600,Cordova,Metamorphic,2710 Kvg,Valdez Group: Gneiss,Late Cretaceous,"Muscovite-biotite-quartz-plagioclase (+/- sillimanite and garnet) schist, banded gneiss, and migmatitic gneiss; many local intrusive stringers, dikes, and sills of granodiorite and granite. Transitional into schistose rocks to the north, south, and west.",,,CV003,609,Cordova,Metamorphic,2715 Kvg,Valdez Group: Paragneiss,Late Cretaceous,"Predominantly metasedimentary rocks with well-developed gneissic foliation consisting of alternating quartz and feldspar-rich layers with biotite-rich layers. The paragneiss is brown weathering, medium grained, and banded on a 2 to 4 mm scale. However, thicker biotite-rich layers are also found. Quartz segregations parallel to the banding are common but not laterally continuous. Locally some layers in the paragneiss contain 1-in.-long porphyroblasts of andalusite. This unit contains up to 10 percent orthogneiss. The orthogneiss is cream colored or light gray, coarse grained, contains less biotite than the paragneiss, and locally grades into normal textured granitic rocks containing abundant inclusions of country rock.",,,CV002,610,Cordova,Metamorphic,2715 green,Schist,Cretaceous ?,Upper greenschist to amphibolite facies schist derived from metamorphism of interbedded graywacke and argillite of the Valdez Group,,,CV005,507,Cordova,Metamorphic,2715 pink,Transitional gneiss,Age not given,Upper amphibolite facies schist and gneiss interlayered at scale of meters to centimeters. Top of unit marked by appearance of quartofeldspathic segregations in metapelite and base of unit marked by loss of stratal continuity through development of gneissic segregations,,,CV005,508,Cordova,Metamorphic,2715 gray,Gneiss,Age not given,"Gray, banded quartzofeldspathic gneiss",,,CV005,509,Cordova,Metamorphic,2715 green,Schist,Cretaceous ?,Upper greenschist to amphibolite facies schist derived from metamorphism of interbedded graywacke and argillite of the Valdez Group,,,CV006,505,Cordova,Metamorphic,2715 pink,Transitional gneiss,Age not given,Upper amphibolite facies schist and gneiss interlayered at scale of meters to centimeters. Top of unit marked by appearance of quartofeldspathic segregations in metapelite and base of unit marked by loss of stratal continuity through development of gneissic segregations,,,CV006,506,Cordova,Metamorphic,2715 gray,Gneiss,Age not given,"Gray, banded quartzofeldspathic gneiss",,,CV006,507,Cordova,Metamorphic,2715 orange,Orthogneiss,Age not given,Metamorphosed plutonic rocks. Mostly Ti2 plutons within the gneissic core of the complex,,,CV006,509,Cordova,Metamorphic,2715 Tgd,Granodioritic rocks,Tertiary,Granodiorite and quartz diorite,,Age assigned revised based on Nelson and others (1983),KN002,1350,Kenai,Igneous,2900 Js,Sedimentary rocks,Jurassic,"Sedimentary rocks, undifferentiated",,,SV005,5300,Seldovia,Sedimentary,3000 Js,Sedimentary rocks,Jurassic,"Sedimentary rocks, undifferentiated",,,KN011,11300,Kenai,Sedimentary,3000 Jn,Naknek Formation,Late Jurassic (Oxfordian to Kimmeridgian),"Arkose, conglomerate, sandstone, siltstone, and shale","Ammonites and pelecypods, especially Buchia which provides tight age control",,SV002,47,Seldovia,Sedimentary,3010 Jn,Naknek Formation,Late Jurassic,"Sandstone, arkose, conglomerate, and siltstone",,,KN002,3010,Kenai,Sedimentary,3010 Jnss,"Naknek Formation, lower sandstone member",Late Jurassic,"Thin-bedded to massive arkosic sandstone, graywacke, and siltstone, mainly restricted to central part of region",,,KN005,516,Kenai,Sedimentary,3012 Jnss,"Naknek Formation, lower sandstone member",Late Jurassic,"Thin-bedded to massive arkosic sandstone, graywacke, and siltstone, mainly restricted to central part of region",,,SV004,516,Seldovia,Sedimentary,3012 Jns,"Naknek Formation, Snug Harbor Siltstone Member",Late Jurassic,Massive to thin-bedded dark-gray to black siltstone; laminated near base,,,KN005,515,Kenai,Sedimentary,3013 Jns,"Naknek Formation, Snug Harbor Siltstone Member",Late Jurassic,Massive to thin-bedded dark-gray to black siltstone; laminated near base,,,SV004,515,Seldovia,Sedimentary,3013 Jnp,"Naknek Formation, Pomeroy Arkose Member",Late Jurassic,Massive light-gray arkose and arkosic conglomerate; minor interbeds of siltstone,,,KN005,514,Kenai,Sedimentary,3014 Jnp,"Naknek Formation, Pomeroy Arkose Member",Late Jurassic,Massive light-gray arkose and arkosic conglomerate; minor interbeds of siltstone,,,SV004,514,Seldovia,Sedimentary,3014 Jnc,"Naknek Formation, Chisik Conglomerate Member",Late Jurassic,"Massive cobble-boulder conglomerate, mainly restricted to area adjacent to Iniskin Bay and Tuxedni Bay",,,KN005,517,Kenai,Sedimentary,3016 Jcp,"Chinitna Formation, Paveloff Siltstone Member",Late Jurassic,"Massive to thin-bedded gray arenaceous siltstone, weathers gray, large ellipsoidal concretions and lenticular beds of limestone, massive sandstone unit at base",,,KN005,518,Kenai,Sedimentary,3020 Jcp,"Chinitna Formation, Paveloff Siltstone Member",Late Jurassic,"Massive to thin-bedded gray arenaceous siltstone, weathers gray, large ellipsoidal concretions and lenticular beds of limestone, massive sandstone unit at base",,,SV004,518,Seldovia,Sedimentary,3020 Jc,Chinitna Formation,Late Jurassic (Callovian),"Primarily dark-gray to brown massive arenacous siltstone containing a few sandstone interbeds and numerous limestone concretions. Unit is subdivided into members, however not on this map","Abundant fossils, including many species of ammonites: Cadoceras, C. stenocadoceras, C. pseudocadoceras, Kepplerites, Kheraiceras, Lilloettia, and Gowericeras. Also especially known for Iniskinites and Chinitnites",,SV002,32,Seldovia,Sedimentary,3025 Jc,Chinitna Formation,Late Jurassic,"Siltstone, limestone concretions, and sandstone",,,KN002,3030,Kenai,Sedimentary,3025 Jct,"Chinitna Formation, Tonnie Siltstone Member",Late Jurassic,"Massive to thin-bedded brownish-gray arenaceous siltstone, weathers red-brown, small yellowish-brown limestone concretions in parallel bands, minor sandstone at base",,,KN005,519,Kenai,Sedimentary,3030 Jct,"Chinitna Formation, Tonnie Siltstone Member",Late Jurassic,"Massive to thin-bedded brownish-gray arenaceous siltstone, weathers red-brown, small yellowish-brown limestone concretions in parallel bands, minor sandstone at base",,,SV004,519,Seldovia,Sedimentary,3030 Jtu,Tuxedni Formation,Middle to Late Jurassic (Bajocian to Callovian),"Light- to dark-gray and green graywacke, conglomerate, siltstone, and shale. Graywacke ranges from feldspathic to lithic to laumontitic; conglomerate composed mainly of volcanic clasts in a graywacke matrix. Unit is subdivided into Formation, however not on this map. Formations are : Red Glacier, Fitz Creek Siltstone, Cynthia Falls Sandstone, Twist Creek Siltstone, and the Bowser Formation","Abundantly fossiliferous, containing ammonites and pelecypods. Key ammonites include Erycites, Tmetoceras, Sonninia, Stemmatoceras, Emileia, Stephanoceras, Chondroceras, and many others",,SV002,50,Seldovia,Sedimentary,3180 Jt,Tuxedni Formation,Middle Jurassic,"Sandstone, siltstone, and limy concretions",,,KN002,3180,Kenai,Sedimentary,3180,, Jtb,"Tuxedni Group, Bowser Formation",Middle and Late Jurassic,"Heterogeneous assemblage of sandstone, conglomerate, shale and siltstone characterized by rapid facies changes. Massive light- to dark-gray sandstone and conglomerate are the dominant lithologic types on the Iniskin Peninsula. The sandstone and the conglomerate matrix are coarse-grained and composed of angular fragments of feldspar and quartz, having biotite, augite, and magnetite as common accessory minerals. The light-gray sandstones are interbedded with the dark-gray sandstone and are commonly calcareous and contain numerous coquina beds composed almost entirely of the pelecypods Inoceramus and Trigonia. Clasts in the conglomerate are dominantly felsic volcanic rocks and basalt, but include about 10 percent granitic rocks. Siltstone as much as 100-m-thick occurs with the conglomerate and sandstone and north of Chinitna Bay occurs in units as much as 250-m-thick, where it forms the dominant unit in the Bowser Formation. The siltstone is massive to thin-bedded, medium- to coarse-grained, dark-brownish gray, weathering to light-brown. Lenticular limestone concretions containing ammonites are common north of Chinitna Bay. The Formation ranges in overall thickness from 380 to 560 m","Abundantly fossiliferous, containing ammonites and pelecypods, the units can be divided into two faunal zones which correspond to the break between the Middle and Upper Jurassic. The lower faunal zone immediately overlies the unconformity with the Twist Creek Siltstone and contains the ammonites Cranocephalites, Arctocephalites, Siemiradzkia, Cobbanites, and Parareineckia and is of middle Bathonian in age. The upper faunal zone contains the ammonites Xenocephalites, Kheraiceras, and Kepplerites of late Bathonian age",,KN005,520,Kenai,Sedimentary,3181,, Jtb,"Tuxedni Group, Bowser Formation",Middle and Late Jurassic,"Heterogeneous assemblage of sandstone, conglomerate, shale and siltstone characterized by rapid facies changes. Massive light- to dark-gray sandstone and conglomerate are the dominant lithologic types on the Iniskin Peninsula. The sandstone and the conglomerate matrix are coarse-grained and composed of angular fragments of feldspar and quartz, having biotite, augite, and magnetite as common accessory minerals. The light-gray sandstones are interbedded with the dark-gray sandstone and are commonly calcareous and contain numerous coquina beds composed almost entirely of the pelecypods Inoceramus and Trigonia. Clasts in the conglomerate are dominantly felsic volcanic rocks and basalt, but include about 10 percent granitic rocks. Siltstone as much as 100-m-thick occurs with the conglomerate and sandstone and north of Chinitna Bay occurs in units as much as 250-m-thick, where it forms the dominant unit in the Bowser Formation. The siltstone is massive to thin-bedded, medium- to coarse-grained, dark-brownish gray, weathering to light-brown. Lenticular limestone concretions containing ammonites are common north of Chinitna Bay. The Formation ranges in overall thickness from 380 to 560 m","Abundantly fossiliferous, containing ammonites and pelecypods, the units can be divided into two faunal zones which correspond to the break between the Middle and Upper Jurassic. The lower faunal zone immediately overlies the unconformity with the Twist Creek Siltstone and contains the ammonites Cranocephalites, Arctocephalites, Siemiradzkia, Cobbanites, and Parareineckia and is of middle Bathonian in age. The upper faunal zone contains the ammonites Xenocephalites, Kheraiceras, and Kepplerites of late Bathonian age",,SV004,520,Seldovia,Sedimentary,3181,, Jtt,"Tuxedni Group, Twist Creek Siltstone",Middle Jurassic,"Soft, poorly consolidated, thin-bedded to massive siltstone and silty shale as much 125-m-thick. The siltstone is dark-gray, weathering to dark-rusty brown and contains many thin beds of volcanic ash that weather a bright orange color. Small limestone concretions commonly fossiliferous and are common throughout the unit","Abundant ammonite fauna which includes Oppelia (Liroxyites), Megasphaerceras, Leptoshinctes, Lissoceras, and Normannites (Dettermanites)",,KN005,521,Kenai,Sedimentary,3182,, Jtt,"Tuxedni Group, Twist Creek Siltstone",Middle Jurassic,"Soft, poorly consolidated, thin-bedded to massive siltstone and silty shale as much 125-m-thick. The siltstone is dark-gray, weathering to dark-rusty brown and contains many thin beds of volcanic ash that weather a bright orange color. Small limestone concretions commonly fossiliferous and are common throughout the unit","Abundant ammonite fauna which includes Oppelia (Liroxyites), Megasphaerceras, Leptoshinctes, Lissoceras, and Normannites (Dettermanites)",,SV004,521,Seldovia,Sedimentary,3182,, Jtc,"Tuxedni Group, Cynthia Falls Sandstone",Middle Jurassic,"Massive to thick-bedded graywacke sandstone and pebble conglomerate about 200-m-thick. The sandstone is medium- to coarse-grained, greenish-gray to dark-green, weathering mottled light-gray due to zeolites and has graded bedding. The sandstone consists mainly of angular fragments of feldspar and volcanic rocks in a compositionally similar silt-size matrix. The pebble conglomerate occurs in thin lenticular beds within the sandstone and is well sorted within individual beds. Clasts consist of ""red and green felsitic volcanic rocks, aphanitic igneous rocks, and a few metasedimentary rocks that are primarily dark-gray quartzite"" (Detterman and Hartsock, 1966, p. 32). Coarse-grained siltstone is interbedded with the sandstone and the siltstone may contain a few limestone concretions. The siltstone may make up 10 to 15 percent of the formation",The sparse fauna includes the ammonites Chondroceras and Stephanoceras as well as the pelecypods Inoceramus sp. and Mytilus sp.,,KN005,522,Kenai,Sedimentary,3183,, Jtc,"Tuxedni Group, Cynthia Falls Sandstone",Middle Jurassic,"Massive to thick-bedded graywacke sandstone and pebble conglomerate about 200-m-thick. The sandstone is medium- to coarse-grained, greenish-gray to dark-green, weathering mottled light-gray due to zeolites and has graded bedding. The sandstone consists mainly of angular fragments of feldspar and volcanic rocks in a compositionally similar silt-size matrix. The pebble conglomerate occurs in thin lenticular beds within the sandstone and is well sorted within individual beds. Clasts consist of ""red and green felsitic volcanic rocks, aphanitic igneous rocks, and a few metasedimentary rocks that are primarily dark-gray quartzite"" (Detterman and Hartsock, 1966, p. 32). Coarse-grained siltstone is interbedded with the sandstone and the siltstone may contain a few limestone concretions. The siltstone may make up 10 to 15 percent of the formation",The sparse fauna includes the ammonites Chondroceras and Stephanoceras as well as the pelecypods Inoceramus sp. and Mytilus sp.,,SV004,522,Seldovia,Sedimentary,3183,, Jtf,"Tuxedni Group, Fitz Creek Siltstone",Middle Jurassic,"Thick sequence of massive, bluish dark-gray, arenaceous coarse- to fine-grained siltstone that commonly weathers rusty orange and contains many small limestone concretions. Interbedded are fine-grained sandstone and, locally, conglomerate interbeds. In the upper part of the unit the siltstone could possibly be called a silty shale. The unit is coarsest in the vicinity of Gaikema Creek and rapidly becomes finer-grained in all directions away from the Gaikema Creek section","This unit is abundantly fossiliferous and is the first unit of the Tuxedini Group where ammonites are more numerous than pelecypods. A few non-diagnostic brachiopods are also present. The ammonites include Normannites, Teloceras, and Chondroceras and many other species, pelecypods include Inoceramus and Pleuromya, both forms distinctly different than lower part of the Tuxedini Group. The Inoceramus is specifically identified as I. ambiguous Eichwald, different from the common Inoceramus of the older rocks",,KN005,523,Kenai,Sedimentary,3184,, Jtf,"Tuxedni Group, Fitz Creek Siltstone",Middle Jurassic,"Thick sequence of massive, bluish dark-gray, arenaceous coarse- to fine-grained siltstone that commonly weathers rusty orange and contains many small limestone concretions. Interbedded are fine-grained sandstone and, locally, conglomerate interbeds. In the upper part of the unit the siltstone could possibly be called a silty shale. The unit is coarsest in the vicinity of Gaikema Creek and rapidly becomes finer-grained in all directions away from the Gaikema Creek section","This unit is abundantly fossiliferous and is the first unit of the Tuxedini Group where ammonites are more numerous than pelecypods. A few non-diagnostic brachiopods are also present. The ammonites include Normannites, Teloceras, and Chondroceras and many other species, pelecypods include Inoceramus and Pleuromya, both forms distinctly different than lower part of the Tuxedini Group. The Inoceramus is specifically identified as I. ambiguous Eichwald, different from the common Inoceramus of the older rocks",,SV004,523,Seldovia,Sedimentary,3184,, Jtg,"Tuxedni Group, Gaikema Sandstone",Middle Jurassic,"Resistant, cliff-forming, massive to thin-bedded graywacke sandstone and cobble conglomerate showing graded bedding. Conglomerate is confined to the Iniskin Peninsula, clasts in it consist of red and green felsic volcanic rocks, aphanitic igneous rocks and minor metasedimentary rocks, all thought to be derived from the Talkeetna Formation. Rare granitic clasts are the first appearance in the Middle Jurassic of rocks presumably derived from the Alaska-Aleutian Range batholith. Locally, thin-bedded to massive, generally coarse grained to sandy, gray to olive-gray, brownish to rusty brown weathering siltstone is as much as 40 percent of the formation, however, it constitutes generally less than 10 percent of the unit, occurring mainly as thin interbeds in sandstone. Siltstone apparently does not occur in close proximity to the conglomeratic parts of the formation","Fossiliferous throughout, containing pelcypods Meleagrinella, Trigonia, and Inoceramus and ammonites Witchellia(?), Stephanceras and locally, Sonninia (Papilliceras), Lissoceras, and Emileia",,KN005,524,Kenai,Sedimentary,3185,, Jtg,"Tuxedni Group, Gaikema Sandstone",Middle Jurassic,"Resistant, cliff-forming, massive to thin-bedded graywacke sandstone and cobble conglomerate showing graded bedding. Conglomerate is confined to the Iniskin Peninsula, clasts in it consist of red and green felsic volcanic rocks, aphanitic igneous rocks and minor metasedimentary rocks, all thought to be derived from the Talkeetna Formation. Rare granitic clasts are the first appearance in the Middle Jurassic of rocks presumably derived from the Alaska-Aleutian Range batholith. Locally, thin-bedded to massive, generally coarse grained to sandy, gray to olive-gray, brownish to rusty brown weathering siltstone is as much as 40 percent of the formation, however, it constitutes generally less than 10 percent of the unit, occurring mainly as thin interbeds in sandstone. Siltstone apparently does not occur in close proximity to the conglomeratic parts of the formation","Fossiliferous throughout, containing pelcypods Meleagrinella, Trigonia, and Inoceramus and ammonites Witchellia(?), Stephanceras and locally, Sonninia (Papilliceras), Lissoceras, and Emileia",,SV004,524,Seldovia,Sedimentary,3185,, Jtr,"Tuxedni Group, Red Glacier Formation",Middle Jurassic,"Thin-bedded to massive, red-brown weathering dark-gray to moderate olive-gray siltstone concentrated in the upper part of the unit and consisting of about 40 percent of the Formation. The siltstone is highly arenaceous and locally contains lenticular interbeds and concretions of reddish-gray, dense limestone and very minor coal seamlets. Underlying this is light-tan to buff arkosic sandstone making up about 25 percent of the unit and a thick black, silty to arenaceous, very fissile, shale","The Red Glacier Formation is most abundantly fossiliferous in its upper parts, no fossils are known from the lower 2000 feet of the unit. Pelcypods include Meleagrinella, Trigonia, Inoceramus, Camptonectes, and Pleuromya. Ammonites occur in two distinct faunal assemblages. The lower assemblage includes Erycites, Tmetoceras, and Pseudolioceras and this faunal zone from 450 to 1,400 m below the top of the formation. The upper assemblage is in the upper 400 m of the formation and includes Soninia, Emiliea, Parabigottes and in the uppermost 150 meters, also includes Papilliceras, Strigoceras, Lissoceras, Stephanoceras, Stemmatoceras, and Skirroceras",,KN005,525,Kenai,Sedimentary,3186,, Jtr,"Tuxedni Group, Red Glacier Formation",Middle Jurassic,"Thin-bedded to massive, red-brown weathering dark-gray to moderate olive-gray siltstone concentrated in the upper part of the unit and consisting of about 40 percent of the Formation. The siltstone is highly arenaceous and locally contains lenticular interbeds and concretions of reddish-gray, dense limestone and very minor coal seamlets. Underlying this is light-tan to buff arkosic sandstone making up about 25 percent of the unit and a thick black, silty to arenaceous, very fissile, shale","The Red Glacier Formation is most abundantly fossiliferous in its upper parts, no fossils are known from the lower 2000 feet of the unit. Pelcypods include Meleagrinella, Trigonia, Inoceramus, Camptonectes, and Pleuromya. Ammonites occur in two distinct faunal assemblages. The lower assemblage includes Erycites, Tmetoceras, and Pseudolioceras and this faunal zone from 450 to 1,400 m below the top of the formation. The upper assemblage is in the upper 400 m of the formation and includes Soninia, Emiliea, Parabigottes and in the uppermost 150 meters, also includes Papilliceras, Strigoceras, Lissoceras, Stephanoceras, Stemmatoceras, and Skirroceras",,SV004,525,Seldovia,Sedimentary,3186,, Jt,Talkeetna Formation,Early Jurassic (Hettangian to Toarcian),"Mainly volcanic breccia, agglomerate, lava flows, and tuff. Sedimentary rocks locally interbedded but are minor. Informally divided into three members, which correlate with formal members elsewhere. Includes informally named Pogibshi Formation on east side of Cook Inlet",,,SV002,67,Seldovia,Igneous,3250,, KJu,Metasedimentary rocks (undivided),Cretaceous and (or) Jurassic,"Weakly metamorphosed slate and graywacke; locally includes volcanic and intrusive rocks, undivided. Consists of contact metamorposed Talkeetna Formation according to Detterman and others (1976, KN010).",,,KN002,2825,Kenai,Metamorphic,3250,,HFS Jtk,Talkeetna Formation,Early Jurassic,"Volcanic breccia, tuff, agglomerate, and aphanitic lava flows; as mapped, locally includes Kamishak Formation in Ilianna Quad",,,KN002,3250,Kenai,Igneous,3250,, bpT,Jurassic bedrock,Jurassic,"Volcanic flows, tuffs, and breccias, metamorphic equivalents, and granodiorite. Talkeetna Formation and other units",,,KN006,622,Kenai,Igneous,3250,, Jtku,"Talkeetna Formation, undivided",Early Jurassic,"Tuff, sandstone, agglomerate, breccia and some lava flows",,,KN005,529,Kenai,Igneous,3250,, Jv,Volcanic rocks,Jurassic,"Volcanic rocks, locally includes sedimentary rocks",,,KN009,904,Kenai,Igneous,3250,, Jtku,"Talkeetna Formation, undivided",Early Jurassic,"Tuff, sandstone, agglomerate, breccia and some lava flows",,,SV004,529,Seldovia,Igneous,3250,, Mz,Metamorphic rocks,Mesozoic,"Schist, hornfels, and amphibolite, contact metamorphosed Talkeetna Formation",,,KN010,1010,Kenai,Metamorphic,3250,,HFS sv,Sedimentary and volcanic rocks,Cenozoic and Mesozoic,Cheifly Jurassic volcanic rocks; locally includes Mesozoic and Cenozoic sedimentary and volcanic rocks,,,KN012,1206,Kenai,Sedimentary,3250,, Jtkh,"Talkeetna Formation, Horn Mountain Tuff Member",Early Jurassic,"Mottled andesitic tuff, tuffaceous sandstone, and siltstone, locally contains andesitic flows",,,KN005,526,Kenai,Sedimentary,3251,, Jtkp,"Talkeetna Formation, Portage Creek Agglomerate Member",Early Jurassic,"Massive pink agglomerate and some volcanic breccia; minor andesitic flows, locally metasedimentary rock",,,KN005,527,Kenai,Igneous,3252,, Jtkm,"Talkeetna Formation, Marsh Creek Breccia Member",Early Jurassic,"Massive green volcanic breccia, lava flows, in part of submarine origin, interbedded with argillite and meta tuff, low rank metamorphism mainly confined to lower part",,,KN005,528,Kenai,Igneous,3253,, Jt (east),Talkeetna Formation (Pogibshi Formation),Early Jurassic (Hettangian to Toarcian),"Mainly volcanic breccia, agglomerate, lava flows, and tuff. Sedimentary rocks locally interbedded but are minor. Informally named Pogibshi Formation on east side of Cook Inlet",,,SV002,67,Seldovia,Igneous,3265,, Jth,Trondjemite,Jurassic,Trondjemite,,,KN012,1204,Kenai,Igneous,3380,, Jg,Granitic rocks,Jurassic,Granitic rocks of the Alaska-Aleutian Range batholith,,,KN011,11340,Kenai,Igneous,3400,, Jgd,Quartz monzonite,Jurassic,Quartz monzonite,,,KN002,3402,Kenai,Igneous,3402,, Jqm,Quartz monzonite,Jurassic,Medium- to coarse-grained pink to gray granitic-textured quartz monzonite ,,,KN005,532,Kenai,Igneous,3402,, Jqd,"Quartz diorite, diorite, and granodiorite",Jurassic,"Quartz diorite, diorite, and granodiorite",,,KN002,3403,Kenai,Igneous,3403,, Jd,Diorite of Point Bede,Jurassic(?),Fine- to medium-grained nonfoliated quartz diorite.,,,SV002,111,Seldovia,Igneous,3404,, Jto,Tonalite of Dogfish Bay,Jurassic(?),Medium-grained nonfoliated tonalite.,,,SV002,116,Seldovia,Igneous,3404 Jqd,Quartz diorite,Jurassic,Mainly biotite-hornblende-quartz dioriite ,,,KN005,533,Kenai,Igneous,3404 di,Quartz diroite dikes,Jurassic,Quartz diorite dikes,,,KN005,537,Kenai,Igneous,3404 Ju,"Plutonic rocks, undivided",Jurassic,"Plutonic rocks, undivided; chiefly tonalite and trondhjemite",,,KN009,903,Kenai,Igneous,3404 JT,Tonalite,Jurassic,"Tonalite, includes hornblendite, hornblende-biotite quartz diorite, and rare granodiorite, quartz monzonite, and granite",,,KN012,1205,Kenai,Igneous,3404 la,Lamprophyre dikes,Jurassic,Lamprophyre dikes,,,KN005,534,Kenai,Igneous,3420 Jsm,Seldovia metamorphic complex,Early Jurassic,"Marble, quartzite, garnet-mica schist, and glaucophane-bearing amphibolite",,191.1 and 191.7 Ma Ar-Ar on white mica and 191.9 Ma Ar-Ar on hornblende,SV002,10,Seldovia,Metamorphic,3610 JTrp,Port Graham Formation of Kelley (1980),Early Jurassic and Late Triassic,"Dark-gray, carbonaceous limestone and silty limestone, also includes tuff, tuffaceous sedimentary rocks, and chert. Most of unit considered Norian in age.",Bivalves of Late Triassic (Norian) age,,SV002,60,Seldovia,Sedimentary,4019 Trk,Kamishak Formation,Late Triassic,"Limestone, grey to black chert, and porcellanite",,,KN002,4020,Kenai,Sedimentary,4020 J(?)f,Felsite,Jurassic(?) or early Tertiary(?),"Fine-grained aphanitic, light gray felsite",,,SV002,115,Seldovia,Igneous,4310 Jd,Diorite of Point Bede,Jurassic(?),Fine- to medium-grained nonfoliated quartz diorite.,,Newly determined zircon age of approx. 206 Ma,SV008,111,Seldovia,Igneous,4310 Jto,Tonalite of Dogfish Bay,Jurassic(?),Medium-grained nonfoliated tonalite.,,Assigned new nsaclass based on date of Diorite of Point Bede by Dwight Bradley.,SV008,116,Seldovia,Igneous,4310 Mg,Gabbro,Mesozoic,"Dark-green, medium- to coarse-grained gabbro and minor leucogabbro and plagiogranite. Associated with McHugh Complex as fault-bounded bodies.",,,SV002,112,Seldovia,Igneous,4880 Mu,Ultramafic plutonic rocks,Mesozoic,"Predominantly layered, variably serpentinized dunite containing rare to locally abundant layers of chromitite and pyroxenite and fault slices of garnet pyroxenite and serpintinite. Associated with McHugh Complex as fault-bounded bodies.",,,SV002,110,Seldovia,Igneous,4890 Trm,"Metamorphic rocks, undivided",Late(?) Triassic,"Metalimestone, argillite, quartzite, metatuff, greenstone, and phyllite; may in part be equivalent to the Kamishak Formation",,,KN005,530,Kenai,Metamorphic,5220 as,Amphibolite,Early Mesozoic(?),"Amphibolite, locally includes sedimentary rocks",,,KN009,906,Kenai,Metamorphic,5220