EXP 1 /DATA8/GGREEN/COLORADO/GRAVEL/COLO_VALUE.E00 IFO 2~}COLO.ALL~ <21 211252~ '184~}SYMBOL~ ,4-1~ #14-1~ #4-1 20-1 -1 -1-1~ 3 1-~}P1~ 03-1~ #54-1~ #3-1 30-1 -1 -1-1~ 32-~}AGE~ /4-1~ #84-1~ #4-1 20-1 -1 -1-1~ 33-~}UNITS_1A~ (200-1 124-1 200-1 20-1 -1 -1-1~ 34-~}UNITS_1B~ (200-1 2124-1 200-1 20-1 -1 -1-1~ 35-~}UNITS_2A~ (200-1 4124-1 200-1 20-1 -1 -1-1~ 36-~}UNITS_2B~ (200-1 6124-1 200-1 20-1 -1 -1-1~ 37-~}UNITS_2C~ (200-1 8124-1 200-1 20-1 -1 -1-1~ 38-~}LITHO_1~ +5-110124-1~ #5-1 20-1 -1 -1-1~ 39-~}LITH O_2~ *25-110174-1 25-1 20-1 -1 -1-1~ 210-~}LITHO_3~ *40-110424-1 40-1 20-1 -1 -1-1~ 211-~}LITHO_4~ *26-110824-1 26-1 20-1 -1 -1-1~ 212-~}VV~ 04-11108 4-1~ #4-1 20-1 -1 -1-1~ 213-~}HV~ 04-111124-1~ #4-1 20-1 -1 -1-1~ 214-~}GENE RAL_LITHO~ $40-111164-1 40-1 20-1 -1 -1-1~ 215-~}PHYS~ -10-111564-1 10-1 20- 1 -1 -1-1~ 216-~}PHYS_COMM~ (20-111664-1 20-1 20-1 -1 -1-1~ 217-~}CHEM~ .4- 111864-1~ #4-1 20-1 -1 -1-1~ 218-~}CHEM_COMM~ (25-111904-1 25-1 20-1 -1 -1- 1~ 219-~}KNOWN_SOURCE~ &3-112154-1~ #3-1 20-1 -1 -1-1~ 220-~}OTHER_USE~ (35-11 2184-1 35-1 20-1 -1 -1-1~ 221-~}Qa~ $1Q~ #MODERN ALLUVIUM ~}~}~}~}~}~ +Includ es Piney Creek Alluvium and younger deposits ~}~}~}~}~}~}~}~ Sunconalluvium~} mi xed~ Z~ #mod highsand~}and gravel~ 9sat~ ;inc~}~ .yes ~}Qg~ $2Q~ #GRAVELS AND AL LUVIUMS (PINEDALE AND BULL LAKE AGE) ~}~}~}~}~}~ +Includes Broadway and Louviers Alluviums ~}~}~}~}~}~}~}~ Sunconalluvium~} coarse~ Z mod highsand~}and gravel~ 9sat~ ;inc~}~ .yes ~}Qgo~ #3Q~ #OLDER GRAVELS AND ALLUVIUMS (PRE-BULL LAKE AGE) ~}~}~}~}~}~ +Includes Slocum Verdos Rocky Flats and Nussbaum Alluviums in east and~} Florida Bridgetimber and Bayfield Gravels in southwest ~}~}~}~}~}~}~ Sunc onalluvium~} coarse~ Z mod highsand~}and gravel~ 9poor~ :del~}~ .yesbarrow ~}Qe ~ $4Q~ #EOLIAN DEPOSITS ~}~}~}~}~}~ +Includes dune sand and silt and Peoria Loes s ~}~}~}~}~}~}~}~ Sunconeolian~} sand/loess~ Xlow low sand~}~ Cunsuitable~}~ .no sand ~}Qeo~ #5Q~ #OLDER EOLIAN DEPOSITS - INCLUDES LOVELAND LOESS ~}~}~}~}~}~ + ~}~}~}~}~}~}~}~ Sunconeolian~} loess~ Z~ #low low loess~}~ Cunsuitable~}~ .no ~}Qd~ $6Q~ #GLACIAL DRIFT OF PINEDALE AND BULL LAKE GLACIATIONS ~}~}~}~}~}~ +Inc ludes some unclassified glacial deposits ~}~}~}~}~}~}~}~ Sunconglacial drift~} m ixed~ Z~ #highhighglaci~}al~ Aunsuitable~}~ .yes ~}Qdo~ #7Q~ #OLDER GLACIAL DRIF T (PRE-BULL LAKE AGE) ~}~}~}~}~}~ + ~}~}~}~}~}~}~}~ Sunconglacial drift~}~ Z~ )m od highglaci~}al~ Asat~ 'local Qa and outwashinc~}~ .yes ~}Ql~ $8Q~ #LANDSLIDE D EPOSITS ~}~}~}~}~}~ +Locally includes talus rock-glacier and thick colluvial dep osits ~}~}~}~}~}~}~}~ Sunconlandslide~} mixed~ Z~ #low highlands~}lide~ ?unsuita ble~}~ .no ~}Qb~ $9Q~ #BASALT FLOWS (AGE <1.8 M.Y. 1) ~}~}~}~}~}~ + ~}~}~}~}~}~ }~}~ Sext mafic~} basalt~ Z low low basal~}t~ Bsat~ ;inc~}~ .no ~}QTsa 10QT UNCLASSIFIED SURFICIAL DEPOSITS AND UNDERLYING ALAMOSA FM(GRAVEL SAND~} AND SI LT) IN SAN LUIS VALLEY ~}~}~}~}~ + ~}~}~}~}~}~}~}~ Sunconalluvium~} mixed~ Z~ #h ighmod sand~}and gravel~ 9poor~ &weathered~ +del clay~}~ .no ~}QTa 11QT ANCIE NT ALLUVIUM ~}~}~}~}~}~ +In isolated patches that may not all be of the same age ~}~}~}~}~}~}~}~ Sunconalluvium~} mixed~ Z~ #low mod sand~}and gravel~ 9poor~ &h ighly weathered~ $del clay~}~ .no ~}To~ #12T~ #OGALLALA FM ~}~}~}~}~}~ +Loose t o well-cemented sand and gravel ~}~}~}~}~}~}~}~ Ssed clastic~} coarse~ Bsemi-co nsolidated~ )low mod sand~}and gravel~ 9poor~ &weathered~ +inc clay~}~ .no ~}Tg v 13T~ #BOULDERY GRAVEL ON OLD EROSION SURFACES IN FRONT RANGE AND NEVER SUMM~} ER MOUNTAINS ~}~}~}~}~ +gravel ~}~}~}~}~}~}~}~ Sunconalluvium~} gravel~ Z low l ow sand~}and gravel~ 9poor~ &weathered~ +del clay~}~ .no ~}Ta~ #14T~ #ARIKAREE FM ~}~}~}~}~}~ +Sandstone - contains abundant volcanically derived material ~}~ }~}~}~}~}~}~ Ssed clastic~} coarse~ Bvolcanic debris~ +low low sands~}tone~ ?un suitable~}~ .no ~}Twr 15T~ #WHITE RIVER FM OR GROUP ~}~}~}~}~}~ +Ashy clayston e and sandstone - Includes Castle Rock Conglomerate in r~}egion southeast of Den ver - Ashy claystone in North Park ~}~}~}~}~}~}~ Ssed clastic~} mixed~ Ctufface ous~ 0low mod mixed~} seds~ >unsuitable~}~ .no ~}Th~ #16T~ #HUERFANO FM ~}~}~}~ }~}~ +Shale and sandstone - Includes Farisita Conglomerate in northwestern~}Huer fano County ~}~}~}~}~}~}~ Ssed clastic~} mixed~ Z~ #mod mod mixed~} seds~ >unsu itable~}~ .no ~}Tcu 17T~ #CUCHARA FM ~}~}~}~}~}~ +Sandstone and shale ~}~}~ S ~}~}~}~ + ~}~}~ Ssed clastic~} mixed~ Z~ #low low mixed~} seds~ >unsuitable~}~ .no ~}Tpc 18T~ #POISON CANYON FM ~}~}~}~}~}~ +Arkosic conglomerate sandstone a nd shale ~}~}~ S ~}~}~}~ + ~}~}~ Ssed clastic~} mixed arkosic~ Umod mod mixed~} seds~ >unsuitable~}~ .no ~}Tdu 19T~ #UPPER PART OF DAWSON ARKOSE ~}~}~}~}~}~ + Arkosic sandstone conglomerate and shale - Includes Green Mountain Co~}nglomerat e south of Golden ~}~ S ~}~}~}~ + ~}~}~ Ssed clastic~} mixed arkosic~ Umod mod mixed~} seds~ >unsuitable~}~ .no ~}Tbp 20T~ #BROWNS PARK FM ~}~}~}~}~}~ +Sands tone and siltstone west of Park Range ~}~}~ S ~}~}~}~ + ~}~}~ Ssed clastic~} mi xed~ Z~ #low low mixed~} seds~ >unsuitable~}~ .no ~}Tt~ #21T~ #TROUBLESOME FM ~} ~}~}~}~}~ +Sandstone and siltstone in Middle Park ~}~}~ S ~}~}~}~ + ~}~}~ Ssed clastic~} mixed~ Z~ #low low mixed~} seds~ >unsuitable~}~ .no ~}Tnp 22T~ #NOR TH PARK FM ~}~}~}~}~}~ +Sandstone siltstone and conglomerate in North Park and L aramie basin ~}~}~ S ~}~}~}~ + ~}~}~ Ssed clastic~} mixed~ Cconglomerate~ .mod mod mixed~} seds~ >unsuitable~}~ .no ~}Tos 23T~ #OLIGOCENE SEDIMENTARY ROCKS ~ }~}~}~}~}~ +Includes Duchesne River Fm (sandstone and shale - includes some rock s~} of Eocene age) and Bishop Conglomerate near Utah border in northwest - Inclu des~} Florissant Lake Beds (tuffaceous [cont] ~ +shale and tuff) and Antero F~}m (limestone tuff - tuffaceous sandstone and conglomerate) in south-central - I~ }ncludes Creede Fm (tuffaceous siltstone sandstone conglomerate) and gravels [co n~}t] ~ (interbedded with volcanic rocks northeast and southeast of Gunnison i~} n southwest ~}~ Ssed clastic~} mixed~ Cinterbedded volcanics~ %highhighmixed~} seds~ >poor~ &weathered~ +del clay~}~ .no ~}Tu~ #25T~ #UINTA FM ~}~}~}~}~}~ +Sa ndstone and siltstone in Piceance basin - Formerly Evacuation Creek~} Member of Green River Fm ~}~ S ~}~}~}~ + ~}~}~ Ssed clastic~} mixed~ Z~ #low low mixed~} seds~ >unsuitable~}~ .no ~}Tb~ #26T~ #BRIDGER FM ~}~}~}~}~}~ +Claystone and mud stone - Sand Wash basin ~}~}~ S ~}~}~}~ + ~}~}~ Ssed clastic~} fine~ Z~ $low lo w mixed~} seds~ >unsuitable~}~ .no ~}Tg~ #27T~ #GREEN RIVER FM ~}~}~}~}~}~ +Marl stone sandstone and oil shale ~}~}~ S ~}~}~}~ + ~}~}~ Ssed clastic~} mixed~ Coi l shale~ 1mod low mixed~} seds~ >unsuitable~}~ .no ~}Tgp 28T~ #GREEN RIVER FM ~ }~}~}~}~}~ +Parachute Creek Member--Oil shale marlstone and siltstone in Piceanc e~} basin ~}~ S ~}~}~}~ + ~}~}~ Ssed clastic~} fine~ Doil shale~ 1low low mixed ~} seds~ >unsuitable~}~ .no ~}Tgl 29T~ #GREEN RIVER FM ~}~}~}~}~}~ +Lower part- -Shale sandstone marlstone and limestone in Anvil Points G~}arden Gulch and Doug las Creek Members in Piceance basin ~}~ S ~}~}~}~ + ~}~}~ Ssed clastic~} mixed~ Cwith carbonate~ ,mod low mixed~} seds~ >unsuitable~}~ .no ~}Tglm 30T~ #LOWER P ART OF GREEN RIVER FM AND WASATCH FM ~}~}~}~}~}~ +Shale and sandstone ~}~}~ S ~} ~}~}~ + ~}~}~ Ssed clastic~} mixed~ Z~ #mod low mixed~} seds~ >unsuitable~}~ .n o ~}Tgt 31T~ #GREEN RIVER FM ~}~}~}~}~}~ +Tipton Tongue--Claystone and oil shal e in Sand Wash basin - In extrem~}e northwest includes rocks of Wilkins Peak Mem ber ~}~ S ~}~}~}~ + ~}~}~ Ssed clastic~} fine~ Doil shale~ 1low mod shale~}~ Cu nsuitable~}~ .no ~}Tglu 32T~ #GREEN RIVER FM ~}~}~}~}~}~ +Luman Tongue--Carbonac eous shale and marlstone in Sand Wash basin ~}~}~ S ~}~}~}~ + ~}~}~ Ssed clasti c~} fine~ Dcarbonaceous~ .low low shale~}~ Cunsuitable~}~ .no ~}Tglw 33T~ #LOWER PART OF GREEN RIVER FM AND WASATCH FM ~}~}~}~}~}~ +Shale and sandstone ~}~}~ S ~}~}~}~ + ~}~}~ Ssed clastic~} mixed~ Z~ #mod low mixed~} seds~ >unsuitable~}~ .no ~}Tw~ #34T~ #WASATCH FM ~}~}~}~}~}~ +Claystone shale and sandstone ~}~}~}~} ~}~}~}~ Ssed clastic~} mixed~ Z~ #mod low mixed~} seds~ >unsuitable~}~ .no ~}Tw c 35T~ #GREEN RIVER FM ~}~}~}~}~}~ +Cathedral Bluffs Tongue--Claystone mudstone and sandstone in Sand Was~}h Basin ~}~}~}~}~}~}~ Ssed clastic~} mixed~ Z~ #mod low mixed~} seds~ >unsuitable~}~ .no ~}Twn 36T~ #GREEN RIVER FM ~}~}~}~}~}~ +N iland Tongue--Mudstone sandstone and carbonaceous shale in Sand Wash~} basin ~}~ }~}~}~}~}~ Ssed clastic~} mixed~ Ccarbonaceous~ .mod low mixed~} seds~ >unsuita ble~}~ .no ~}Two 37T~ #WASATCH FM (INCLUDING FORT UNION EQUIVALENT AT BASE) AND OHIO CREEK F~}M ~}~}~}~}~ +Claystone mudstone sandstone and conglomerate ~}~}~} ~}~}~}~}~ Ssed clastic~} mixed~ Z~ #mod low mixed~} seds~ >unsuitable~}~ .no ~} Tf~ #38T~ #FORT UNION FM ~}~}~}~}~}~ +Shale sandstone and local coal beds ~}~}~} ~}~}~}~}~ Ssed clastic~} mixed~ Cwith coal~ 1mod mod mixed~} seds~ >unsuitable~ }~ .no ~}Tc~ #39T~ #COALMONT FM ~}~}~}~}~}~ +Arkosic sandstone conglomerate and shale - coal in lower part in Nort~}h Park ~}~}~}~}~}~}~ Ssed clastic~} mixed arkosic~ ;with coal~ 1highmod mixed~} seds~ >unsuitable~}~ .no ~}Tm~ #40T~ #MID DLE PARK FM EXCLUSIVE OF WINDY GAP MEMBER ~}~}~}~}~}~ +Arkosic sandstone and con glomerate containing abundant volcanic mater~}ials ~}~}~}~}~}~}~ Ssed clastic~} mixed arkosic~ ;volcanic debris~ +low low mixed~} seds~ >unsuitable~}~ .no ~}Td ~ #41T~ #DRY UNION FM ~}~}~}~}~}~ +Siltstone sandstone and conglomerate - Includ es Wagontongue Fm (Mioce~}ne) in South Park ~}~}~}~}~}~}~ Ssed clastic~} mixed~ Z~ #mod highmixed~} seds~ >poor~ &weathered~ +del clay~}~ .no ~}Ts~ #42T~ #SANT A FE FM ~}~}~}~}~}~ +Siltstone sandstone and conglomerate ~}~}~}~}~}~}~}~ Ssed clastic~} mixed~ Z~ #mod mod mixed~} seds~ >poor~ &weathered~ +del clay~}~ .no ~}Tsp 43T~ #SOUTH PARK FM ~}~}~}~}~}~ +Arkosic sandstone and shale volcaniclas tic conglomerate and andesite~}flows and breccia ~}~}~}~}~}~}~ Ssed clastic~} m ixed arkosic~ ;interbedded volcanics~ %highhighseds~}and volcanics~ 6sat~ 'andes ites~ +inc~}~ .no ~}Tlp 44T~ #LOS PINOS FM ~}~}~}~}~}~ +Volcaniclastic conglome rate interbedded with basalt flows of Hinsdale~} Fm (Tbb) on east flank of San J uan Mountains - Grades laterally into Santa Fe F~}m of San Luis Valley ~}~}~}~}~ }~ Ssed volcaniclastic~} coarse~ Binterbedded volcanics~ %highhighseds~}and vol canics~ 6sat~ 'basalts~ -inc~}~ .no ~}Tsj 45T~ #SAN JOSE FM ~}~}~}~}~}~ +Siltst one shale and sandstone ~}~}~}~}~}~}~}~ Ssed clastic~} mixed~ Z~ #mod low mixed ~} seds~ >unsuitable~}~ .no ~}Te~ #46T~ #EOCENE PREVOLCANIC SEDIMENTARY ROCKS ~} ~}~}~}~}~ +Arkosic sand and bouldery gravel of Echo Park Alluvium in south-centr ~}al - Includes Telluride Conglomerate and Blanco Basin Fm (arkosic mudstone san ds~}tone and conglomerate) in southwest ~}~}~}~}~}~ Ssed clastic~} mixed arkosi c~ ;conglomerate~ .mod mod sand~}and gravel~ 9poor~ &weathered~ +del clay~}~ .no ~}Tn~ #47T~ #NACIMIENTO FM ~}~}~}~}~}~ +Shale and sandstone ~}~}~}~}~}~}~}~ Sse d clastic~} mixed~ Z~ #mod low mixed~} seds~ >unsuitable~}~ .no ~}Tbb 48T~ #BA SALT FLOWS AND ASSOCIATED TUFF BRECCIA AND CONGLOMERATE OF LATEVOLC~}ANIC BIMODA L SUITE (AGE 3.5-26 M.Y.) ~}~}~}~}~ +Includes basalts of Hinsdale Fm in San Juan Mountains - Servilleta Fm~} in San Luis Valley and many other occurrences ~}~}~ }~}~}~}~ Sext mafic~} basalt~ Binterbedded sediments~ %low low basal~}t~ Bsat~ ;inc~}~ .no ~}Tbbi 49T~ #BASALTIC INTRUSIVE ROCKS RELATED TO BASALT FLOWS (Tbb) ~}~}~}~}~}~ +In dikes and plugs ~}~}~}~}~}~}~}~ Sint mafic~} basalt~ Z low lo w basal~}t~ Bsat~ ;inc~}~ .no ~}Tbr 50T~ #RHYOLITIC INTRUSIVE ROCKS AND FLOWS O F LATE-VOLCANIC BIMODAL SUITE ~}~}~}~}~}~ + ~}~}~}~}~}~}~}~ Sint felsic~} rhyol ite~ Zlow low rhyol~}ite~ @sat~ ;del microcrysta~}lline quartz no ~}Tbrt 51T~ #ASH-FLOW TUFF OF LATE-VOLCANIC BIMODAL SUITE (AGE 22-23 M.Y. ~}~}~}~}~}~ + ~}~ }~}~}~}~}~}~ Sext felsic~} ashflow~ Z mod low ashfl~}ow~ Asat~ ;del microcrysta ~}lline quartz no ~}Taf 52T~ #ASH-FLOW TUFF OF MAIN VOLCANIC SEQUENCE (AGE IN SAN JUAN MOUNTAINS 26~}-30 M.Y. - IN SOUTH PARK 29-32 M.Y.) ~}~}~}~}~ +Includes many named units ~}~}~}~}~}~}~}~ Sext felsic~} ashflow~ Z highhighashfl~}ow~ A sat~ ;del microcrysta~}lline quartz no ~}Tial 53T~ #INTRA-ASH FLOW ANDESITIC L AVAS ~}~}~}~}~}~ + ~}~}~}~}~}~}~}~ Sext intermediate~} andesite~ Zlow low andes ~}ite~ @sat~ ;inc~}~ .no ~}Tiql 54T~ #INTRA-ASH FLOW QUARTZ LATITIC LAVAS ~}~}~ }~}~}~ + ~}~}~}~}~}~}~}~ Sext felsic~} quartz latite~ Ulow low quart~}z latite~ ;sat~ ;inc~}~ .no ~}Tpl 55T~ #PRE-ASH-FLOW ANDESITIC LAVAS BRECCIAS TUFFS AND CONGLOMERATES (GENERA~}L AGE 30-35 M.Y.) ~}~}~}~}~ +Includes several named unit s ~}~}~}~}~}~}~}~ Sext intermediate~} andesite~ @interbedded sediments~ %highhi ghandes~}ite~ @fair~ &possible slteration del~}~ .no ~}Twm 56T~ #WALL MOUNTAIN TUFF (OLDER THAN TUFFS OF SAN JUAN PROVENANCE; AGE 35-3~}6M.Y.) ~}~}~}~}~ +Earl y ash-flow tuff of Sawatch Range provenance ~}~}~}~}~}~}~}~ Sext felsic~} ashfl ow~ Z low low ashfl~}ow~ Asat~ ;del~}~ .no ~}Tv~ #57T~ #VOLCANIC ROCKS IN NORTH WESTERN COLORADO (AGE <7-33 M.Y.) ~}~}~}~}~}~ +Mainly of intermediate compositio ns ~}~}~}~}~}~}~}~ Sext intermediate~}~ Z~ )low low inter~}mediate volcanics~ 2 sat~ ;inc~}~ .no ~}Tui 58T~ #UPPER TERTIARY INTRUSIVE ROCKS (AGE <20 M.Y.) ~}~ }~}~}~}~ +Intermediate to felsic compositions ~}~}~}~}~}~}~}~ Sint intermediate /felsic~}~ Z~ )low low felsi~}c intrusive/intermediate intrusive sat~ ;inc~}~ .n o ~}Tmi 59T~ #MIDDLE TERTIARY INTRUSIVE ROCKS (AGE 20-40 M.Y.) ~}~}~}~}~}~ +In termediate to felsic compositions ~}~}~}~}~}~}~}~ Sint intermediate/felsic~}~ Z ~ )low low felsi~}c intrusive/intermediate intrusive sat~ ;inc~}~ .no ~}TKda 60 TK DENVER AND ARAPAHOE FMS ~}~}~}~}~}~ +Sandstone mudstone claystone and conglo merate; Denver is characterize~}d by andesitic materials ~}~}~}~}~}~}~ Ssed cla stic~} mixed~ Cvolcanic debris~ +highmod mixed~} seds~ >unsuitable~}~ .no ~}Tdv 61T~ #BASALTIC FLOWS IN DENVER FM NEAR GOLDEN (AGE 62-64 M.Y.) ~}~}~}~}~}~ + ~ }~}~}~}~}~}~}~ Sext mafic~} basalt~ Z low low basal~}t~ Bsat~ ;inc~}~ .no ~}T Kdl 62TK DENVER FM OR LOWER PART OF DAWSON ARKOSE ~}~}~}~}~}~ +Arkosic sandston e shale mudstone conglomerate and local coal beds ~}~}~}~}~}~}~}~ Ssed clastic ~} mixed arkosic~ ;with coal~ 1highhighmixed~} seds~ >unsuitable~}~ .no clay ~}T Kr 63TK RATON FM ~}~}~}~}~}~ +Arkosic sandstone siltstone and shale - contains major coal deposits~}in Raton Basin ~}~}~}~}~}~}~ Ssed clastic~} mixed arkosic ~ ;with coal~ 1mod highmixed~} seds~ >unsuitable~}~ .no ~}TKa 64TK ANIMAS FM ~}~}~}~}~}~ +Arkosic sandstone shale and conglomerate - contains abundant volcan ic~} materials - Upper Cretaceous volcaniclastic McDermott Member at base ~}~}~} ~}~}~}~ Ssed clastic~} mixed arkosic~ ;volcanic debris~ +mod low mixed~} seds~ >unsuitable~}~ .no ~}TKec 65TK TELLURIDE CONGLOMERATE OF EOCENE PREVOLCANIC S EDIMENTARY ROCKS (Te) A~}ND CIMARRON RIDGE FM (UPPER CRETACEOUS - VOLCANIC BRECC IA AND CONGLOMERATE - AGE~} ABOUT 66 M.Y.) ~}~}~}~ +In northwestern San Juan Mou ntains ~}~}~}~}~}~}~}~ Ssed clastic~} coarse~ Bconglomerate~ .mod highcongl~}om erate~ unsuitable~}~ .no brick clay ~}Kf~ # 68K~ #FOX HILLS SANDSTONE ~}~}~}~}~}~ + ~}~}~}~}~}~}~}~ Ssed clastic~} coarse~ Bsandstone~ 1low low sands~}tone~ ?unsuitable~}~ .no brick clay ~}Klf 69K~ #LA RAMIE FM AND FOX HILLS SANDSTONE ~}~}~}~}~}~ + ~}~}~}~}~}~}~}~ Ssed clastic~} m ixed~ Z~ #mod mod mixed~} seds~ >unsuitable~}~ .no brick clay ~}Kvt 70K~ #VERME JO FM AND TRINIDAD SANDSTONE ~}~}~}~}~}~ +Shale sandstone and major coal beds ~} ~}~}~}~}~}~}~ Ssed clastic~} mixed~ Cwith coal~ 1mod mod mixed~} seds~ >unsuita ble~}~ .no ~}Kp~ #71K~ #PIERRE SHALE UNDIVIDED ~}~}~}~}~}~ + ~}~}~}~}~}~}~}~ Ss ed clastic~} fine~ Dshale~ 5low low shale~}~ Cunsuitable~}~ .no ~}Kpu 72K~ #P IERRE SHALE ~}~}~}~}~}~ +Upper unit ~}~}~}~}~}~}~}~ Ssed clastic~} fine~ Dshale ~ 5low low shale~}~ Cunsuitable~}~ .no ~}Kpm 73K~ #PIERRE SHALE ~}~}~}~}~}~ +M iddle unit--In Boulder-Fort Collins area contains Richard Larimer Ro~}cky Ridge Terry and Hygiene Sandstone Members; elsewhere shale between zones of~}Baculite s reesidei and B. scotti ~}~}~}~}~}~ Ssed clastic~} fine~ Dshale~ 5mod highshal e~}~ Cunsuitable~}~ .no ~}Kpl 74K~ #PIERRE SHALE ~}~}~}~}~}~ +Lower unit--Shar on Springs Member (organic-rich shale and numerous be~}ntonite beds) in lower pa rt ~}~}~}~}~}~}~ Ssed clastic~} fine~ Dorganic~ 3low low shale~}~ Cunsuitable~} ~ .no ~}Kn~ #75K~ #NIOBRARA FM ~}~}~}~}~}~ +Calcareous shale and limestone ~}~} ~}~}~}~}~}~ Ssed clastic~} fine~ Dwith carbonate~ ,mod low mixed~} carbonate~ 9 fair~ &soft~ 0inc~}~ .no cement ~}Kcg 76K~ #CARLILE SHALE GREENHORN LIMESTONE A ND GRANEROS SHALE ~}~}~}~}~}~ + ~}~}~}~}~}~}~}~ Ssed clastic~} fine~ Dwith carb onate~ ,low low mixed~} carbonate~ 9fair~ &soft~ 0inc~}~ .no ~}Kc~ #77K~ #COLOR ADO GROUP--NIOBRARA FM (Kn) and either BENTON SHALE or CARLILE G~}REENHORN and G RANEROS FMS (Kcg) ~}~}~}~}~ + ~}~}~}~}~}~}~}~ Ssed clastic~} fine~ Dwith carbon ate~ ,highhighmixed~} carbonate~ 9fair~ &soft~ 0inc~}~ .no cement hi-Ca limeston e brick clay ~}Kpg 78K~ #PIERRE SHALE (Kp) NIOBRARA (Kn) AND CARLILE GREENHORN AND GRANEROS (K~}cg) FMS UNDIVIDED ~}~}~}~}~ + ~}~}~}~}~}~}~}~ Ssed clastic~} fine~ Dwith carbonate~ ,highhighmixed~} carbonate~ 9fair~ &soft~ 0inc~}~ .no ce ment ~}Kdp 79K~ #DAKOTA SANDSTONE AND PURGATOIRE FM ~}~}~}~}~}~ +Sandstone and shale ~}~}~}~}~}~}~}~ Ssed clastic~} mixed~ Z~ #low low mixed~} seds~ >unsuita ble~}~ .no fire clay ~}Kd~ #80K~ #DAKOTA SANDSTONE ~}~}~}~}~}~ + ~}~}~}~}~}~}~}~ Ssed clastic~} coarse~ Bsandstone~ 1low low sands~}tone~ ?unsuitable~}~ .no di mension fire clay ~}Kmw 81K~ #WINDY GAP MEMBER (UPPER CRETACEOUS?) OF MIDDLE PA RK FM ~}~}~}~}~}~ +Andesitic breccia and conglomerate ~}~}~}~}~}~}~}~ Ssed volc aniclastic~} coarse~ Bvolcanic debris~ +highlow mixed~} seds~ >unsuitable~}~ .no ~}Kls 82K~ #LEWIS SHALE ~}~}~}~}~}~ + ~}~}~ S ~}~}~}~}~}~ Ssed clastic~} fin e~ Dshale~ 5low low shale~}~ Cunsuitable~}~ .no ~}Kmv 83K~ #MESAVERDE FM (UNDI VIDED) ~}~}~}~}~}~ +Major coal beds in lower part - Rollins Sandstone Member at base in D~}elta Gunnison and Pitkin Counties ~}~ S ~}~}~}~}~}~ Ssed clastic~} mixed~ Cwith coal~ 1mod mod mixed~} seds~ >unsuitable~}~ .no brick clay fire cl ay ~}Kmvu 84K~ #MESAVERDE GROUP OR FM ~}~}~}~}~}~ +Upper part--In Moffat and Rio Blanco Counties:sandstone shale and coa~}l beds above Sego Sandstone - Along Gr and Hogback south of Colorado River:sandst~}one and shale above coal-bearing seq uence ~ ) ~}~}~}~}~}~ Ssed clastic~} mixed~ Cwith coal~ 1highmod mixed~} seds~ >unsuitable~}~ .no ~}Kmvl 85K~ #MESAVERDE GROUP OR FM ~}~}~}~}~}~ +Lower part- -Sandstone shale and major coal beds ~}~}~ S ~}~}~}~}~}~ Ssed clastic~} mixed~ Cwith coal~ 1highmod mixed~} seds~ >unsuitable~}~ .no brick clay fire clay ~}Kw ~ #86K~ #WILLIAMS FORK FM ~}~}~}~}~}~ +Sandstone shale and major coal beds ~}~}~ S ~}~}~}~}~}~ Ssed clastic~} mixed~ Cwith coal~ 1mod low mixed~} seds~ >unsuit able~}~ .no ~}Ki~ #87K~ #ILES FM ~}~}~}~}~}~ +Sandstone and shale - Trout Creek Sandstone Member at top - coal beds~} in upper half ~}~ S ~}~}~}~}~}~ Ssed cla stic~} mixed~ Cwith coal~ 1mod mod mixed~} seds~ >unsuitable~}~ .no ~}Kh~ #88K~ #HUNTER CANYON FM ~}~}~}~}~}~ +Sandstone and shale ~}~}~ S ~}~}~}~}~}~ Ssed cl astic~} mixed~ Z~ #mod low mixed~} seds~ >unsuitable~}~ .no ~}Ksc 89K~ #SEGO S ANDSTONE BUCK TONGUE OF MANCOS SHALE AND CASTLEGATE SANDSTONE ~}~}~}~}~}~ + ~}~} ~ S ~}~}~}~}~}~ Ssed clastic~} coarse~ Bsandstone~ 1mod low sands~}tone~ ?unsui table~}~ .no ~}Kmgs 90K~ #MOUNT GARFIELD FM AND SEGO SANDSTONE ~}~}~}~}~}~ +San dstone and shale - major coal beds in lower part of Mount Garfield~} ~}~ S ~}~}~ }~}~}~ Ssed clastic~} mixed~ Cwith coal~ 1mod mod mixed~} seds~ >unsuitable~}~ .no ~}Km~ #91K~ #MANCOS SHALE ~}~}~}~}~}~ +Intertongues complexly with units o f overlying Mesaverde Group or Fm~}- lower part consists of a calcareous Niobrar a equivalent and Frontier Sandstone~} and Mowry Shale Members - in areas [cont] ~ (where the Frontier and Mowry~}Members (Kmfm)or - these and the Dakota Sandsto ne (Kfd) are distinguished map un~}it (Km) consists of shale above Frontier Memb er ~}~}~}~ Ssed clastic~} fine~ Dshale~ 5mod highshale~}~ Cunsuitable~}~ .no br ick clay fire clay ~}Kmfm 92K~ #MANCOS SHALE ~}~}~}~}~}~ +Frontier Sandstone and Mowry Shale Members and intervening shale zone~} ~}~ S ~}~}~}~}~}~ Ssed clasti c~} mixed~ Z~ #mod low mixed~} seds~ >unsuitable~}~ .no brick clay fire clay ~}K fd 93K~ #FRONTIER SANDSTONE AND MOWRY SHALE MEMBERS OF MANCOS SHALE AND DAKOTA~ } SANDSTONE ~}~}~}~}~ +Locally includes - at base - Burro Canyon Fm (shale and s andstone) or~} Cedar Mountain Fm(conglomerate and shale) in western Moffat Count y ~}~ S ~}~}~}~}~}~ Ssed clastic~} mixed~ Z~ #mod highmixed~} seds~ >unsuitable ~}~ .no ~}Kdb 94K~ #DAKOTA SANDSTONE AND BURRO CANYON FM ~}~}~}~}~}~ +Sandston e shale and conglomerate ~}~}~ S ~}~}~}~}~}~ Ssed clastic~} mixed~ Z~ #mod low mixed~} seds~ >unsuitable~}~ .no sand fire clay ~}Kkf 95K~ #KIRTLAND SHALE AND FRUITLAND FM ~}~}~}~}~}~ +Shale sandstone and major coal beds ~}~}~ S ~}~}~}~}~ }~ Ssed clastic~} mixed~ Cwith coal~ 1mod low mixed~} seds~ >unsuitable~}~ .no ~}Kpcl 96K~ #PICTURED CLIFFS SANDSTONE AND LEWIS SHALE ~}~}~}~}~}~ + ~}~}~ S ~ }~}~}~}~}~ Ssed clastic~} mixed~ Z~ #mod low mixed~} seds~ >unsuitable~}~ .no ~}Kch 97K~ #CLIFF HOUSE SANDSTONE ~}~}~}~}~}~ + ~}~}~ S ~}~}~}~}~}~ Ssed clast ic~} coarse~ Bsandstone~ 1low low sands~}tone~ ?unsuitable~}~ .no ~}Kmp 98K~ # MENEFEE FM (SANDSTONE SHALE AND COAL) AND POINT LOOKOUT SANDSTONE ~}~}~}~}~}~ + ~}~}~}~}~}~}~}~ Ssed clastic~} mixed~ Cwith coal~ 1mod mod mixed~} seds~ >unsui table~}~ .no ~}Kmj 99K~ #MANCOS SHALE ~}~}~}~}~}~ +Juana Lopez Member--Calcare ous sandstone - a thin but persistent unit~} distinguished only locally ~}~}~}~} ~}~}~ Ssed clastic~} coarse~ Bsandstone~ 1low low sands~}tone~ ?unsuitable~}~ . no ~}KJdm100KJ DAKOTA AND MORRISON FMS ~}~}~}~}~}~ + ~}~}~}~}~}~}~}~ Ssed cla stic~} mixed~ Z~ #mod mod mixed~} seds~ >unsuitable~}~ .no none ~}KJdj101KJ DAK OTA BURRO CANYON MORRISON AND JUNCTION CREEK FMS ~}~}~}~}~}~ +Burro Canyon is lo cally absent ~}~}~}~}~}~}~}~ Ssed clastic~} mixed~ Z~ #highhighmixed~} seds~ >u nsuitable~}~ .no ~}KJdw102KJ DAKOTA BURRO CANYON MORRISON AND WANAKAH FMS ~}~} ~}~}~}~ + ~}~}~}~}~}~}~}~ Ssed clastic~} mixed~ Z~ #highmod mixed~} seds~ >unsu itable~}~ .no ~}KJdr103KJ DAKOTA GROUP AND MORRISON AND RALSTON CREEK FMS AT M OUNTAIN FRONT BET~}WEEN BOULDER AND COLORADO SPRINGS - DAKOTA PURGATOIRE MORRISO N AND RALSTON CREEK~} FMS IN CANON CITY AREA ~}~}~}~ + ~}~}~}~}~}~}~}~ Ssed cla stic~} mixed~ Z~ #mod highmixed~} seds~ >unsuitable~}~ .no fire clay ~}KJde104KJ DAKOTA PURGATOIRE MORRISON RALSTON CREEK AND ENTRADA FMS IN SOUTHEAST~} - DAKO TA MORRISON AND ENTRADA FMS IN CENTRAL MOUNTAINS - DAKOTA BURRO CANYON MO~}RRISO N WANAKAH AND ENTRADA FMS -[cont] ~ ,IN GUNNISON RIVER AREA - DAKO~}TA MORRISON CURTIS AND ENTRADA FMS IN NORTHWEST ~}~}~ + ~}~}~}~}~}~}~}~ Ssed clastic~} mix ed~ Z~ #highhighmixed~} seds~ >unsuitable~}~ .no none ~}KJds105KJ DAKOTA MORRIS ON AND SUNDANCE FMS ~}~}~}~}~}~ + ~}~}~}~}~}~}~}~ Ssed clastic~} mixed~ Z~ #mod mod mixed~} seds~ >unsuitable~}~ .no none ~}Jm 106J~ #MORRISON FM ~}~}~}~}~}~ +Variegated claystone mudstone sandstone and local beds of limestone ~}~}~}~}~} ~}~}~ Ssed clastic~} fine~ Dwith carbonate~ ,mod low mixed~} seds~ >unsuitable~ }~ .no none ~}Jmj 107J~ #MORRISON FM AND JUNCTION CREEK SANDSTONE ~}~}~}~}~}~ +I n Gunnison River area east of wedgeout of all units of Wanakah Fm (J~}mw) except the Junction Creek Member ~}~}~}~}~}~}~ Ssed clastic~} mixed~ Z~ #mod highmixe d~} seds~ >unsuitable~}~ .no ~}Jmc 108J~ #MORRISON FM AND CURTIS FM (GLAUCONITI C SANDSTONE AND LIMESTONE) ~}~}~}~}~}~ + ~}~}~}~}~}~}~}~ Ssed clastic~} mixed~ Cwith carbonate~ ,mod low mixed~} seds~ >unsuitable~}~ .no ~}Jmw 109J~ #MORRIS ON FM AND WANAKAH FM (SANDSTONE SHALE LIMESTONE AND LOCAL GYPSU~}M - JUNCTION CR EEK SANDSTONE MEMBER AT OR NEAR TOP - PONY EXPRESS LIMESTONE MEMB~}ER AT BASE) ~ }~}~}~ + ~}~}~}~}~}~}~}~ Ssed clastic~} mixed~ Cwith carbonate~ ,highmod mixed~ } seds~ >unsuitable~}~ .no ~}Jmr 110J~ #MORRISON AND RALSTON CREEK FMS ~}~}~}~} ~}~ +Claystone sandstone limestone and gypsum ~}~}~}~}~}~}~}~ Ssed clastic~} mi xed~ Cwith carbonate~ ,highmod mixed~} seds~ >unsuitable~}~ .no fire clay ~}Jme 111J~ #MORRISON FM AND ENTRADA SANDSTONE ~}~}~}~}~}~ + ~}~}~}~}~}~}~}~ Ssed cl astic~} mixed~ Z~ #mod low mixed~} seds~ >unsuitable~}~ .no ~}Jms 112J~ #MORRIS ON FM AND SUNDANCE FM ~}~}~}~}~}~ +Sandstone shale claystone and limestone ~}~}~ }~}~}~}~}~ Ssed clastic~} mixed~ Cwith carbonate~ ,highmod mixed~} seds~ >unsui table~}~ .no ~}Jmse113J~ #MORRISON FM SUMMERVILLE FM (SHALE AND SILTSTONE) AND ENTRADA SANDSTON~}E ~}~}~}~}~ + ~}~}~}~}~}~}~}~ Ssed clastic~} mixed~ Z~ #mod mod mixed~} seds~ >unsuitable~}~ .no ~}Jmce114J~ #MORRISON CURTIS AND ENTRADA FMS ~}~}~}~}~}~ +In extreme southwestern Moffat County includes thin wedge of C armel F~}m (red siltstone and sandstone) beneath Entrada ~}~}~}~}~}~}~ Ssed cla stic~} mixed~ Z~ #highmod mixed~} seds~ >unsuitable~}~ .no ~}Jmre115J~ #MORRISO N RALSTON CREEK AND ENTRADA (OR EXETER) FMS ~}~}~}~}~}~ + ~}~}~}~}~}~}~}~ Ssed clastic~} mixed~ Z~ #highmod mixed~} seds~ >unsuitable~}~ .no fire clay ~}Jmwe 116J~ #MORRISON WANAKAH AND ENTRADA FMS ~}~}~}~}~}~ + ~}~}~}~}~}~}~}~ Ssed clas tic~} mixed~ Z~ #mod mod mixed~} seds~ >unsuitable~}~ .no ~}J@g 117J@ GLEN CAN YON SANDSTONE ~}~}~}~}~}~ +In northwest ~}~}~}~}~}~}~}~ Ssed clastic~} coarse~ Bsandstone~ 1low low sands~}tone~ ?unsuitable~}~ .no ~}J@gc118J@ GLEN CANYON GROUP AND CHINLE FM ~}~}~}~}~}~ +In southwest Glen Canyon Group consists of Nav ajo Sandstone Kayenta F~}m (red siltstone shale and sandstone) and Wingate Sands tone - Chinle is red silt~}stone ~}~}~}~}~}~ Ssed clastic~} mixed~ Credbeds~ 3m od mod mixed~} seds~ >unsuitable~}~ .no ~}J@mg119J@ MORRISON CURTIS ENTRADA AN D GLEN CANYON FMS ~}~}~}~}~}~ +Curtis is absent along Grand Hogback ~}~}~}~}~}~} ~}~ Ssed clastic~} mixed~ Z~ #mod highmixed~} seds~ >unsuitable~}~ .no ~}J@mc1 20J@ MORRISON ENTRADA AND CHINLE FMS ~}~}~}~}~}~ +Along southern Grand Hogback Chinle is represented only by basal Gart~}ra Sandstone Member ~}~}~}~}~}~}~ Sse d clastic~} mixed~ Z~ #mod highmixed~} seds~ >unsuitable~}~ .no ~}@kc 121@~ #K AYENTA FM (RED SILTSTONE SHALE AND SANDSTONE) WINGATE SANDSTONE AND~}CHINLE FM ( RED SILTSTONE AND SANDSTONE) ~}~}~}~}~ + ~}~}~}~}~}~}~}~ Ssed clastic~} mixed~ Credbeds~ 3highmod mixed~} seds~ >unsuitable~}~ .no ~}@wc 122@~ #WINGATE SANDS TONE AND CHINLE FM ~}~}~}~}~}~ + ~}~}~}~}~}~}~}~ Ssed clastic~} mixed~ Z~ #mod mod mixed~} seds~ >unsuitable~}~ .no ~}@m 123@~ #MOENKOPI FM ~}~}~}~}~}~ +Red siltstone mudstone sandstone and local gypsum ~}~}~}~}~}~}~}~ Ssed clastic~} m ixed~ Credbeds/with gypsum~ 'mod low mixed~} seds~ >unsuitable~}~ .no ~}@ch 124 @~ #CHUGWATER FM ~}~}~}~}~}~ +Red sandstone siltstone shale and local limestone and gypsum ~}~}~}~}~}~}~}~ Ssed clastic~} mixed~ Credbeds/with carbonate~ $hig hmod mixed~} seds~ >unsuitable~}~ .no ~}@cc 125@~ #CHINLE AND CHUGWATER FMS ~}~ }~}~}~}~ + ~}~}~}~}~}~}~}~ Ssed clastic~} mixed~ Z~ #mod mod mixed~} seds~ >uns uitable~}~ .no ~}@c 126@~ #CHINLE FM ~}~}~}~}~}~ +Red siltstone sandstone and limestone-pellet conglomerate ~}~}~}~}~}~}~}~ Ssed clastic~} mixed~ Credbeds/w ith carbonate~ $mod low mixed~} seds~ >unsuitable~}~ .no ~}@d 127@~ #DOLORES F M ~}~}~}~}~}~ +Red siltstone shale sandstone and limestone-conglomerate ~}~}~}~} ~}~}~}~ Ssed clastic~} mixed~ Credbeds/with carbonate~ $mod mod mixed~} seds~ > unsuitable~}~ .no ~}@dg 128@~ #DOCKUM GROUP ~}~}~}~}~}~ +Red sandstone siltston e and local limestone ~}~}~}~}~}~}~}~ Ssed clastic~} mixed~ Credbeds/with carbo nate~ $mod mod mixed~} seds~ >unsuitable~}~ .no ~}@Pl 129@P LYKINS FM ~}~}~}~} ~}~ +Red siltstone shale and limestone ~}~}~}~}~}~}~}~ Ssed clastic~} fine~ Dre dbeds/with carbonate~ $mod low mixed~} seds~ >unsuitable~}~ .no none ~}@Ps 130@P STATE BRIDGE FM ~}~}~}~}~}~ +Red and orange siltstone and sandstone ~}~}~}~}~} ~}~}~ Ssed clastic~} mixed~ Credbeds~ 3mod low mixed~} seds~ >unsuitable~}~ .no ~}@Pll131@P LYKINS FM AND LYONS SANDSTONE ~}~}~}~}~}~ + ~}~}~}~}~}~}~}~ Ssed clastic~} mixed~ Credbeds~ 3low low mixed~} seds~ >unsuitable~}~ .no dimension ~}@Pjs132@P JELM LYKINS LYONS AND SATANKA FMS ~}~}~}~}~}~ +Red siltstone shale and sandstone ~}~}~}~}~}~}~}~ Ssed clastic~} mixed~ Credbeds~ 3mod low mixed~} seds~ >unsuitable~}~ .no dimension ~}@Pcs133@P CHINLE AND STATE BRIDGE FMS ~}~ }~}~}~}~ +Red siltstone and sandstone ~}~}~}~}~}~}~}~ Ssed clastic~} mixed~ Cre dbeds~ 3low low mixed~} seds~ >unsuitable~}~ .no ~}@Pcp134@P CHINLE MOENKOPI A ND PARK CITY FMS ~}~}~}~}~}~ +Red and gray siltstone shale and sandstone ~}~}~}~ }~}~}~}~ Ssed clastic~} mixed~ Credbeds~ 3mod mod mixed~} seds~ >unsuitable~}~ .no ~}@Pr 135@P TRIASSIC AND PERMIAN ROCKS ~}~}~}~}~}~ +Red siltstone shale a nd sandstone - Includes various combinations of~}Nugget Jelm Popo Agie Chugwater Red Peak Forelle Satanka and Goose Egg Fms near~}Wyoming border ~}~}~}~}~}~ Sse d clastic~} mixed~ Credbeds~ 3mod highmixed~} seds~ >unsuitable~}~ .no ~}@Pdc1 36@P DOLORES FM (UPPER TRIASSIC) AND CUTLER FM (LOWER PERMIAN) ~}~}~}~}~}~ +Red siltstone sandstone and conglomerate ~}~}~}~}~}~}~}~ Ssed clastic~} mixed~ Cre dbeds~ 3mod mod mixed~} seds~ >unsuitable~}~ .no ~}@Pmc137@P MOENKOPI FM (LOWE R TRIASSIC) AND CUTLER FM (LOWER PERMIAN) ~}~}~}~}~}~ +Red siltstone and sandsto ne ~}~}~}~}~}~}~}~ Ssed clastic~} mixed~ Credbeds~ 3mod mod mixed~} seds~ >unsu itable~}~ .no ~}@&lf138@& LYKINS LYONS AND FOUNTAIN FMS ~}~}~}~}~}~ +Red silts tone sandstone and conglomerate ~}~}~}~}~}~}~}~ Ssed clastic~} mixed~ Credbeds~ 3mod low mixed~} seds~ >unsuitable~}~ .no dimension barrow ~}Pp 139P~ #PARK CI TY FM ~}~}~}~}~}~ +Calcareous siltstone and sandstone ~}~}~}~}~}~}~}~ Ssed clas tic~} mixed~ Z~ #low low mixed~} seds~ >unsuitable~}~ .no ~}Pu 140P~ #UPPER PE RMIAN ROCKS UNDIVIDED ~}~}~}~}~}~ +Siltstone dolomite and sandstone in southeast ~}~}~}~}~}~}~}~ Ssed clastic~} mixed~ Cwith carbonate~ ,highmod mixed~} seds~ >unsuitable~}~ .no ~}Pc 141P~ #CUTLER FM ~}~}~}~}~}~ +Arkosic sandstone silts tone and conglomerate ~}~}~}~}~}~}~}~ Ssed clastic~} mixed arkosic~ Umod mod mi xed~} seds~ >unsuitable~}~ .no ~}Mz 142Mz MESOZOIC ROCKS ~}~}~}~}~}~ +Mainly Lower Cretaceous Jurassic and Triassic Fms ~}~}~}~}~}~}~}~ Ssed clastic~} mixe d~ Z~ #mod highmixed~} seds~ >unsuitable~}~ .no ~}MzPz143MzPzMESOZOIC AND PALEO ZOIC ROCKS ~}~}~}~}~}~ +Mainly as in Mesozoic unit (Mz) plus Permian and Pennsyl vanian Fms ~}~}~}~}~}~}~}~ Ssed clastic~} mixed~ Z~ #highhighmixed~} seds~ >uns uitable~}~ .no ~}P&f 144P& FOUNTAIN FM ~}~}~}~}~}~ +Arkosic sandstone and cong lomerate ~}~}~}~}~}~}~}~ Ssed clastic~} coarse~ Bmixed arkosic~ -low low sands~ }tone~ ?unsuitable~}~ .no dimension barrow ~}P&cf145P& CASPER FM (SANDSTONE) AN D LOWER PART OF FOUNTAIN FM ~}~}~}~}~}~ + ~}~}~}~}~}~}~}~ Ssed clastic~} coarse ~ Barkosic~ 3low low sands~}tone~ ?unsuitable~}~ .no ~}P&if146P& INGLESIDE FM AND FOUNTAIN FM ~}~}~}~}~}~ +Limestone and calcareous sandstone and arkosic san dstone and conglome~}rate ~}~}~}~}~}~}~ Ssed clastic~} mixed arkosic~ ;with car bonate~ ,mod mod mixed~} seds~ >unsuitable~}~ .no dimension ~}P&s 147P& SANGRE DE CRISTO FM ~}~}~}~}~}~ +Arkosic conglomerate sandstone and siltstone ~}~}~}~} ~}~}~}~ Ssed clastic~} mixed arkosic~ Ulow low mixed~} seds~ >unsuitable~}~ .no ~}P&m 148P& MAROON FM ~}~}~}~}~}~ +Arkosic sandstone siltstone conglomerate a nd local limestone ~}~}~}~}~}~}~}~ Ssed clastic~} mixed arkosic~ ;with carbonat e~ ,mod mod mixed~} seds~ >unsuitable~}~ .no ~}P&w 149P& WEBER SANDSTONE ~}~}~ }~}~}~ + ~}~}~}~}~}~}~}~ Ssed clastic~} coarse~ Bsandstone~ 1low low sands~}ton e~ ?unsuitable~}~ .no ~}P&wm150P& WEBER SANDSTONE AND MAROON FM ~}~}~}~}~}~ + ~}~}~}~}~}~}~}~ Ssed clastic~} mixed~ Carkosic~ 3mod mod mixed~} seds~ >unsuita ble~}~ .no ~}&m 151&~ #MINTURN FM IN WEST-CENTRAL AND SOUTH-CENTRAL AND OTHER UNITS OF MIDDL~}E PENNSYLVANIAN AGE ~}~}~}~}~ +Arkosic sandstone conglomerate s hale and limestone - Includes Madera~}Fm and Sharpsdale Fm of Chronic (1958) in Sangre de Cristo Range and Gothic Fm o~}f Langenheim (1952) in Elk Mountains ~} ~}~}~}~}~ Ssed clastic~} mixed arkosic~ ;with carbonate~ ,highhighmixed~} seds~ >unsuitable~}~ .no ~}&b 152&~ #BELDEN FM ~}~}~}~}~}~ +Shale limestone and san dstone - Includes Kerber Fm in south-central ~}~}~}~}~}~}~}~ Ssed clastic~} mix ed~ Cwith carbonate~ ,mod highmixed~} seds~ >unsuitable~}~ .no ~}&mb 153&~ #MIN TURN AND BELDEN FMS ~}~}~}~}~}~ + ~}~}~}~}~}~}~}~ Ssed clastic~} mixed~ Cwith c arbonate~ ,highhighmixed~} seds~ >unsuitable~}~ .no ~}&e 154&~ #EAGLE VALLEY F M ~}~}~}~}~}~ +Siltstone shale and local gypsum ~}~}~}~}~}~}~}~ Ssed clastic~} fine~ Dwith gypsum~ /mod mod mixed~} seds~ >unsuitable~}~ .no ~}&ee 155&~ #EAG LE VALLEY FM - EVAPORITIC FACIES ~}~}~}~}~}~ +Gypsum siltstone and shale - salt present in deep borings - Intertong~}ues with Minturn and Lower Maroon Fms - Di apiric structure in many places ~}~}~}~}~}~}~ Ssed evaporite~} gypsum/salt~ =wi th clastics~ -mod highevapo~}rite~ ?unsuitable~}~ .no ~}&mbe156&~ #EVAPORITIC F ACIES OF MINTURN AND BELDEN FMS IN SOUTH PARK AND SOUTHWA~}RD ~}~}~}~}~ +Gypsum siltstone and shale ~}~}~}~}~}~}~}~ Ssed evaporite~} gypsum~ Bwith clastics~ - mod highevapo~}rite~ ?unsuitable~}~ .no ~}&h 157&~ #HERMOSA FM ~}~}~}~}~}~ +Ar kosic sandstone conglomerate shale and limestone - gypsum and salt~}in Paradox M ember present in salt anticlines near Utah border ~}~}~}~}~}~}~ Ssed clastic~} mixed arkosic~ ;with gypsum/salt/carbonatehighhighmixed~} seds~ >unsuitable~}~ .no ~}&rh 158&~ #RICO AND HERMOSA FMS ~}~}~}~}~}~ +Arkosic sandstone conglomer ate shale and limestone - Includes at base~} in some areas siltstone and shale o f Molas Fm or Larsen Quartzite ~}~}~}~}~}~}~ Ssed clastic~} mixed arkosic~ ;wit h carbonate~ ,highhighmixed~} seds~ >unsuitable~}~ .no ~}&mr 159&~ #MORGAN FM ( LIMESTONE SANDSTONE AND SHALE) AND ROUND VALLEY LIMESTONE ~}~}~}~}~}~ +In far no rthwest ~}~}~}~}~}~}~}~ Ssed clastic~} mixed~ Cwith carbonate~ ,mod mod mixed~} seds~ >sat~ 'limestone units~ %inc~}~ .no ~}M_ 160M_ LEADVILLE LIMESTONE (MI SSISSIPPIAN) WILLIAMS CANYON LIMESTONE (DEVONI~}AN) MANITOU LIMESTONE (ORDOVICIA N) AND SAWATCH QUARTZITE (CAMBRIAN) ~}~}~}~}~ + ~}~}~}~}~}~}~}~ Ssed carbonate~ } limestone/dolomite~ 6with clastics~ -mod low mixed~} carbonates~ 8sat~ 'carbon ate~ +inc~}~ .no dimension ~}MDO 161MDO LEADVILLE LIMESTONE WILLIAMS CANYON LIME STONE AND ONE OR MORE ORDOVIC~}IAN FMS: FREMONT LIMESTONE HARDING SANDSTONE AND MANITOU LIMESTONE ~}~}~}~}~ + ~}~}~}~}~}~}~}~ Ssed carbonate~} limestone~ ?wit h clastics~ -mod mod mixed~} carbonates~ 8sat~ 'limestone~ +inc~}~ 1marble ~}DO _ 162DO_ WILLIAMS CANYON LIMESTONE MANITOU LIMESTONE AND SAWATCH QUARTZITE ~}~}~ }~}~}~ + ~}~}~}~}~}~}~}~ Ssed carbonate~} limestone~ ?with clastics~ -low low m ixed~} carbonates~ 8sat~ 'limestone~ +inc~}~ .yesnone ~}O_ 163O_ MANITOU LIMES TONE AND SAWATCH QUARTZITE IN SOUTHERN FRONT RANGE AND W~}ET MOUNTAINS - ONE OR MORE ORDOVICIAN FMS (FREMONT LIMESTONE HARDING SANDSTONE A~}ND MANITOU DOLOMITE ) - DOTSERO FM -[cont]~ *(CAMBRIAN DOLOMITE IN WHITE R~}IVER PLATEAU ONLY) PEERL ESS FM (CAMBRIAN SANDSTONE AND DOLOMITE) AND SAWATCH QUA~}RTZITE (CAMBRIAN) IN W EST-CENTRAL AND SOUTH-CENTRAL ~}~ + ~}~}~}~}~}~}~}~ Ssed carbonate~} limestone/ dolomite~ 6with clastics~ -highmod mixed~} carbonates~ 8sat~ ;inc~}~ .no ~}Or 164Or ONE OR MORE ORDOVICIAN FMS ~}~}~}~}~}~ +Fremont Limestone Harding Sands tone and Manitou Limestone ~}~}~}~}~}~}~}~ Ssed carbonate~} limestone~ ?with cl astics~ -mod low mixed~} carbonates~ 8sat~ 'limestone~ +inc~}~ .no ~}MD 165MD LEADVILLE LIMESTONE (MISSISSIPPIAN) GILMAN SANDSTONE (MISSISSIPPIAN O~}R DEVON IAN) DYER DOLOMITE (MISSISSIPPIAN? AND DEVONIAN) AND PARTING FM (DEVONIAN~} - QU ARTZITE AND SHALE) ~}~}~}~ + ~}~}~}~}~}~}~}~ Ssed carbonate~} limestone/dolomit e~ 6with clastics~ -highmod mixed~} carbonates~ 8sat~ 'limestone~ +inc~}~ .no ~ }MD_ 166MD_ WEST-CENTRAL AND SOUTH-CENTRAL:LEADVILLE GILMAN DYER PARTING AND SAW A~}TCH FMS - UINTA MOUNTAINS:LEADVILLE LIMESTONE (MISSISSIPPIAN) OURAY LIMESTONE (D~}EVONIAN) ELBERT FM -[cont] ~ 8(DEVONIAN SHALE AND SANDSTONE~}) AND IGNACIO QUARTZITE (CAMBRIAN) ~}~}~ + ~}~}~}~}~}~}~}~ Ssed carbonate~} limestone~ ?with clastics~ -highmod mixed~} carbonates~ 8sat~ ;inc~}~ .no ~}DO 167DO PARTING FREMONT AND HARDING FMS ~}~}~}~}~}~ + ~}~}~}~}~}~}~}~ Ssed clastic~} coarse~ B with carbonate~ ,mod low mixed~} seds~ >sat~ 'limestone-dolomite inc~}~ .no ~} _s 168_~ #SAWATCH QUARTZITE ~}~}~}~}~}~ +Locally includes Peerless Fm ~}~}~}~}~ }~}~}~ Ssed clastic~} coarse~ Bsandstone~ 1low mod sands~}tone~ ?unsuitable~}~ .no ~}Mm 169M~ #MADISON LIMESTONE (MISSISSIPPIAN) ~}~}~}~}~}~ +Upper part inc ludes equivalents of Upper Mississippian Doughnut and H~}umbug Fms (shale limest one and sandstone) ~}~}~}~}~}~}~ Ssed carbonate~} limestone~ ?with clastics~ -l ow mod carbo~}nate~ ?sat~ 'limestone~ +inc~}~ .no ~}_l 170_~ #LODORE FM (CAMBR IAN) ~}~}~}~}~}~ +Sandstone shale and conglomerate ~}~}~}~}~}~}~}~ Ssed clastic ~} mixed~ Z~ #mod mod mixed~} seds~ >unsuitable~}~ .no ~}M_ml171M_ MADISON LIM ESTONE AND LODORE FM ~}~}~}~}~}~ + ~}~}~}~}~}~}~}~ Ssed carbonate~} limestone~ ?with clastics~ -mod mod carbo~}nate~ ?sat~ 'limestone~ +inc~}~ .no ~}_am 172_ ~ #INTRUSIVE ROCKS OF CAMBRIAN AGE ~}~}~}~}~}~ +Alkalic and mafic intrusive rock s in small plutons and diabase dikes~}(age 510-570 m.y.) ~}~}~}~}~}~}~ Sint maf ic/alkalic~}~ Z~ )mod highmafic~} intrusive/alkalic intrusive~ 'sat~ ;inc~}~ .no ~}Yu 173Y~ #UINTA MOUNTAIN GROUP (AGE 950-1400 M.Y.) ~}~}~}~}~}~ +Quartzite c onglomerate and shale ~}~}~}~}~}~}~}~ Ssed clastic~} mixed~ Z~ #mod low mixed~} seds~ >sat~ 'quartzite~ +inc~}~ .no ~}YXu 174YX UNCOMPAHGRE FM (OLDER THAN GR ANITES OF 1400-M.Y. AGE GROUP AND YOUNGE~}R THAN GRANITES OF 1700-M.Y. AGE GROUP ) ~}~}~}~}~ +Quartzite slate and phyllite ~}~}~}~}~}~}~}~ Smeta quartzite/slate/ phyllite~} metasedimentary~ Smod mod metas~}edimentary~ 9sat~ ;inc~}~ .no ~}Xb 175X~ #BIOTITIC GNEISS SCHIST AND MIGMATITE ~}~}~}~}~}~ +Locally contains mino r hornblende gneiss calc-silicate rock quartzite~} and marble - Derived principa lly from sedimentary rocks ~}~}~}~}~}~}~ Smeta gneiss/quartzite~} metasedimentar y~ 9calc-silicate~ -highmod gneis~}s~ Bfair~ &foliation fractures inc~}~ .no ~} Xfh 176X~ #FELSIC AND HORNBLENDIC GNEISSES EITHER SEPARATE OR INTERLAYERED ~}~}~ }~}~}~ +Includes metabasalt metatuff and interbedded metagraywacke - locally~}co ntains interlayered biotite gneiss - Derived principally from volcanic rocks ~}~ }~}~}~}~}~ Smeta gneiss~} metavolcanic~ Vmod highgneis~}s~ Bsat~ ;inc~}~ .no ~} Xq 177X~ #QUARTZITE CONGLOMERATE AND INTERLAYERED MICA SCHIST ~}~}~}~}~}~ + ~}~ }~}~}~}~}~}~ Smeta quartzite/schist~} metasedimentary~ Smod low quart~}zite~ ?sa t~ ;inc~}~ .no ~}Wr 178W~ #RED CREEK QUARTZITE ~}~}~}~}~}~ +Metaquartzite amph ibolite and mica schist - Present only in small are~}a at Utah border in Uinta M ountains ~}~ S ~}~}~}~}~}~ Smeta quartzite/schist~} metasedimentary~ Smod low qu art~}zite~ ?sat~ ;inc~}~ .no ~}Yp 179Y~ #ROCKS OF PIKES PEAK BATHOLITH (1000-M .Y. AGE GROUP) ~}~}~}~}~}~ +Includes Pikes Peak Mount Rosa Windy Point and Redsk in Granites and u~}nnamed rocks ~}~ S ~}~}~}~}~}~ Sint felsic~} granite~ Z mod mod grani~}te~ Apoor~ &highly weathered~ $inc~}~ .no quartz ~}Yg 180Y~ #GRANIT IC ROCKS OF 1400-M.Y. AGE GROUP (AGE 1350-1480 M.Y.) ~}~}~}~}~}~ +Includes Silve r Plume Sherman Cripple Creek St. Kevin Vernal Mesa Cur~}ecanti Eolus and Trimbl e Granites or Quartz Monzonites - also San Isabel Granite~} of Boyer (1962) and unnamed granitic rocks ~ ' ~}~}~}~}~}~ Sint felsic~} granite~ Z low low grani~ }te~ Asat~ ;inc~}~ .no ~}Yam 181Y~ #ALKALIC AND MAFIC ROCKS IN SMALL PLUTONS AN D DIABASE AND GABBRO DIKES~} ~}~}~}~}~ + ~}~}~ S ~}~}~}~}~}~ Sint mafic/alkalic ~} diabase/gabbro~ Tlow mod mafic~} intrusive~ 9sat~ ;inc~}~ .no ~}Xg 182X~ #G RANITIC ROCKS OF 1700-M.Y. AGE GROUP (AGE 1650-1730 M.Y.) ~}~}~}~}~}~ +Includes Boulder Creek -M.Y. AGE GROUP (AGE 1650-1730 M.Y.)--Includes~} Boulder Creek Cr oss Creek Denny Creek Kroenke Browns Pass Powderhorn Pitts Mead~}ow Bakers Bridg e and Tenmile [cont] ~ /Granites Quartz Monzonites or~} Granodiorites - also unn amed granitic rocks ~}~}~}~}~ Sint felsic~} granite/granodiorite/quartz monzoni te~ =low mod grani~}te~ Afair~ :inc~}~ .no ~}Xm 183X~ #MAFIC ROCKS OF 1700-M. Y. AGE GROUP ~}~}~}~}~}~ +Gabbro and mafic diorite and monzonite ~}~}~ S ~}~}~}~ }~}~ Sint mafic~} gabbro/diorite~ Tlow mod mafic~} intrusive~ 9sat~ ;inc~}~ .no ~}YXg 184YX GRANITIC ROCKS OF 1400- AND 1700-M.Y. AGE GROUPS UNDIVIDED OR ROC KS W~}ITH CHARACTERISTICS OF Xg BUT U-Th-Pb ZIRCON AGES OF Yg IN TAYLOR RIVER RE GION ~}~}~}~}~ + ~}~}~ S ~}~}~}~}~}~ Sint felsic~} granite~ Z low mod grani~}te ~ Afair~ :inc~}~ .no ~}H2O 200Q~ #H2O ~}~}~}~}~}~ +water ~}~}~ S ~}~}~}~}~}~}~ Z~ 1water~}~ Cunsuitable~}~ .no none ~}EOI~}EOS~}