Geologic units containing conglomerate

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Conglomerate

A coarse-grained clastic sedimentary rock, composed of rounded to subangular fragments larger than 2 mm in diameter typically containing fine-grained particles in the interstices, and commonly cemented by calcium carbonate, iron oxide, silica, or hardened clay...

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Alabama

Attalla Chert Conglomerate Member of the Chickamauga Limestone (Ordovician): Attalla Chert Conglomerate Member of the Chickamauga Limestone - conglomerate of pebbles, cobbles, and boulders of chert and rare dolomite and quartzite in a sand-sized chert and quartz matrix; thin beds of gray-green or dusky-red shale common at base.
Attalla Chert Conglomerate Member of the Chickamauga Limestone (Ordovician): Attalla Chert Conglomerate Member of the Chickamauga Limestone - conglomerate of pebbles, cobbles, and boulders of chert and rare dolomite and quartzite in a sand-sized chert and quartz matrix; thin beds of gray-green or dusky-red shale common at base.
Chickamauga Limestone (Ordovician): Chickamauga Limestone - Medium to dark-gray thick to thin-bedded partly argillaceous, locally fossiliferous limestone. Restricted to the western part of the Valley and Ridge province and Murphrees Valley and Wills Valley anticlines. Locally includes a thin interval of Attalla Chert Conglomerate Member at base. Attalla Chert Conglomerate - conglomerate of pebbles, cobbles, and boulders of chert and rare dolomite and quartzite in a sand-sized matrix; thin beds of gray-green or dusky-red shale common at base.
Chickamauga Limestone (Ordovician): Chickamauga Limestone - Medium to dark-gray thick to thin-bedded partly argillaceous, locally fossiliferous limestone. Restricted to the western part of the Valley and Ridge province and Murphrees Valley and Wills Valley anticlines. Locally includes a thin interval of Attalla Chert Conglomerate Member at base. Attalla Chert Conglomerate - conglomerate of pebbles, cobbles, and boulders of chert and rare dolomite and quartzite in a sand-sized matrix; thin beds of gray-green or dusky-red shale common at base.
Chilhowee Group undifferentiated (Cambrian): Chilhowee Group undifferentiated - light to medium-gray arkose, arkosic conglomerate, and discontinous mudstone overlain by greenish-gray mudstone with minor siltstone and sandstone; dominantly light-gray pebbly quartzose sandstone in upper part.
Cochran Formation (Cambrian): Cochran Formation - poorly sorted arkosic sandstone and conglomerate containing interbedded greenish-gray siltstone and mudstone. The Cochran Formation is exposed only in northeastern Calhoun and northwestern Cleburne Counties.
Pottsville Formation (Pennsylvanian): Pottsville Formation - Light-gray thin to thick-bedded quartzose sandstone and conglomerate containing interbedded dark-gray shale, siltstone, and coal. Mapped on Lookout Mountain, Blount and Chandler Mountains, and Sand Mountain northeats of Blount County, and on the mountains of Jackson, Marshall and Madison Counties north and west of the TN river.
Talladega Group; Butting Ram Sandstone (Silurian?-Devonian): Butting Ram Sandstone - white to light-bluish-gray medium to coarse-grained, locally conglomeratic thick-bedded quartzose sandstone. Possible Devonian fossils.
Talladega Group; Lay Dam Formation, unnamed diamictite facies (Silurian?-Devonian): Talladega Group; Lay Dam Formation, unnamed diamictite facies - Unnamed diamictite facies of Lay Day Formation in Coosa and Chilton Counties consists of cobbles and boulders of carbonate, pelitic rocks, quartzite, chert, felsic plutonic rocks, and gneiss in a metagraywacke matrix.
Weisner and Wilson Ridge Formations undifferentiated (Cambrian): Weisner and Wilson Ridge Formations undifferentiated -- interbedded quartzose to slightly feldspathic sandstone and laterally continous conglomerate in ledge-forming units seperated by greenish-gray silty mudstone.

Arkansas

Blakely Sandstone (Middle and Lower Ordovician) (Phanerozoic | Paleozoic | Ordovician-Early Ordovician-Middle): Blakely Sandstone (Middle and Lower Ordovician)
Cane Hill Member of Hale Formation (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Early [Morrowan]): Cane Hill Member of Hale Formation
Crystal Mountain Sandstone (Phanerozoic | Paleozoic | Ordovician-Early): Crystal Mountain Sandstone

Arizona

Cretaceous to Late Jurassic sedimentary rocks with minor volcanic rocks (Late Jurassic to Cretaceous): Sandstone and conglomerate, rarely forms prominent outcrops; massive conglomerate is typical near base of unit and locally in upper part. These deposits are nonmarine except in southeastern Arizona, where prominent gray marine limestone (Mural Limestone) forms the middle of the Bisbee Group. Sandstones are typically medium-bedded, drab brown, lithic-feldspathic arenites. Includes Bisbee Group (largely Early Cretaceous) and related rocks, Temporal, Bathtub, and Sand Wells formations, rocks of Gu Achi, McCoy Mountains Formation, and Upper Cretaceous Fort Crittenden Formation and equivalent rocks. (80-160 Ma)
Early Proterozoic quartzite (Early Proterozoic): Brown to maroon, resistant quartzite and minor conglomerate of the Mazatzal Group, exposed primarily in the Payson area. (1650? -1700 Ma)
Jurassic sedimentary and volcanic rocks (Jurassic): Sandstone and conglomerate derived from volcanic rocks with associated intermediate-composition lava flows, breccias, and tuffs. In southern Arizona this unit includes rocks of the Artesa sequence, Pitoikam Formation, Mulberry Wash volcanics, Rudolfo Red Beds, Recreation Red Beds, and Gardner Canyon Formation. In western Arizona it includes the Harquar Formation, rocks of Slumgullion, and related(?) unnamed units in the Kofa and Middle Mountains. This unit is characterized by maroon, brown, and purplish-gray volcanic-lithic sandstone and siltstone, with subordinate to abundant conglomerate, quartz-rich sandstone and sparse limestone. (150-170 Ma)
Middle Miocene to Oligocene sedimentary rocks (Oligocene to Middle Miocene): Con-glomerate, sandstone, mudstone, limestone, and rock-avalanche breccia (sheet-like deposits of crushed rock) deposited and tilted during widespread normal faulting and basin development. Sediments, mostly conglomerate and sandstone, are commonly medium to dark brown, reddish brown, or brownish gray; younger strata are generally lighter colors. Most deposits are 20 to 30 Ma in southeastern Arizona and 15 to 25 Ma in central and western Arizona. (11-32 Ma)
Oligocene to Paleocene[?] sedimentary rocks (Paleocene(?) to Oligocene): Light colored, weakly to moderately consolidated conglomerate and sandstone deposited largely or entirely before mid-Tertiary volcanism and extensional faulting. Most sediment was deposited by early Cenozoic streams that flowed northeastward onto the Colorado Plateau from areas to the southwest that are now lower in elevation than the Plateau. Sediments of this map unit, other than the Chuska Sandstone in northeasternmost Arizona, are commonly referred to as "rim gravels" because they now rest on or near the Mogollon Rim, which is the southwestern edge of the Colorado Plateau. (30-65 Ma)
Pliocene to middle Miocene deposits (Middle Miocene to Pliocene): Moderately to strongly consolidated conglomerate and sandstone deposited in basins during and after late Tertiary faulting. Includes lesser amounts of mudstone, siltstone, limestone, and gypsum. These deposits are generally light gray or tan. They commonly form high rounded hills and ridges in modern basins, and locally form prominent bluffs. Deposits of this unit are widely exposed in the dissected basins of southeastern and central Arizona. (2-16 Ma)
Shinarump Conglomerate Member, Chinle Formation (Late Triassic): Basal conglomerate and pebbly sandstone of the Chinle Formation is relatively resistant to erosion and forms extensive benches in some parts of the Colorado Plateau. (210-230 Ma)

California

Carboniferous marine rocks, unit 7 (Bishop) (Mississippian to Early Permian): Shale, sandstone, conglomerate, limestone, dolomite, chert, hornfels, marble, quartzite; in part pyroclastic rocks
Cretaceous marine rocks (in part nonmarine) (?), unit 1 (Blythe) (Middle Jurassic(?) to Late Cretaceous): Undivided Cretaceous sandstone, shale, and conglomerate; minor nonmarine rocks in Peninsular Ranges (?)
Cretaceous marine rocks (in part nonmarine) (?), unit 2 (Jacumba) (Late Cretaceous(?) to Miocene(?)): Undivided Cretaceous sandstone, shale, and conglomerate; minor nonmarine rocks in Peninsular Ranges (?)
Cretaceous marine rocks (in part nonmarine), unit 1 (Coast Ranges) (Early to Late Cretaceous): Undivided Cretaceous sandstone, shale, and conglomerate; minor nonmarine rocks in Peninsular Ranges
Eocene and Paleocene marine rocks, undivided (Paleocene to middle Eocene)
Eocene nonmarine rocks, unit 2 (Southern California) (middle to late Eocene): Sandstone, shale, and conglomerate.
Lower Cretaceous marine rocks (Early Cretaceous): Lower Cretaceous sandstone, shale, and conglomerate
Lower Cretaceous marine rocks (?) (Cretaceous (?)): Lower Cretaceous sandstone, shale, and conglomerate (?)
Miocene marine rocks (?) (Miocene(?) or Pliocene(?))
Miocene nonmarine rocks (Oligocene to Pleistocene): Sandstone, shale, conglomerate, and fanglomerate; in part Pliocene and Oligocene.
Oligocene nonmarine rocks (?), unit 2 (Southeastern California) (Cretaceous(?) to Oligocene(?))
Oligocene nonmarine rocks, unit 1 (Northern California) (Oligocene to Miocene): Sandstone, shale, and conglomerate; in part Miocene and Eocene.
Oligocene nonmarine rocks, unit 2 (Central and Southern California) (middle Eocene to early Miocene): Sandstone, shale, and conglomerate; in part Miocene and Eocene.
Paleocene marine rocks, unit 1 (Central and Southern California) (Paleocene): Sandstone, shale, and conglomerate; mostly well consolidated
Paleocene marine rocks, unit 2 (Northern California) (Paleocene to late Eocene): Sandstone, shale, and conglomerate; mostly well consolidated
Paleocene marine rocks, unit 3 (La Panza Range) (Late Cretaceous(?) to Eocene(?)): Sandstone, shale, and conglomerate; mostly well consolidated
Plio-Pleistocene and Pliocene loosely consolidated deposits (Miocene to Pleistocene): Pliocene and/or Pleistocene sandstone, shale, and gravel deposits; in part Miocene.
Tertiary nonmarine rocks, undivided (Paleocene to Pliocene): Undivided Tertiary sandstone, shale, conglomerate, breccia, and ancient lake deposits.
Upper Cretaceous and Paleocene marine rocks, undivided (Late Cretaceous to Paleocene): Sandstone, shale, and conglomerate
Upper Cretaceous marine rocks (?) (Cretaceous): Upper Cretaceous sandstone, shale, and conglomerate (?)
Upper Cretaceous marine rocks, unit 1 (Upper Great Valley Sequence) (Late Cretaceous): Upper Cretaceous sandstone, shale, and conglomerate

Colorado

Arikaree Fm (Phanerozoic | Cenozoic | Tertiary): Sandstone; contains abundant volcanically derived material
Casper Fm and Lower part of Fountain Fm (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian Permian): Casper Fm: sandstone
Chinle Fm (Phanerozoic | Mesozoic | Triassic): Red siltstone, sandstone, and limestone-pellet conglomerate
Coalmont Fm (Phanerozoic | Cenozoic | Tertiary): Arkosic sandstone, conglomerate, and shale; coal in lower part; in North Park
Cutler Fm (Phanerozoic | Paleozoic | Permian): Arkosic sandstone, siltstone, and conglomerate
Dakota Sandstone and Burro Canyon Fm (Phanerozoic | Mesozoic | Cretaceous): Sandstone, shale, and conglomerate. In northwest and west-central: Lower Cretaceous. In southwest: Lower and Upper Cretaceous.
Denver and Arapahoe Fms (Phanerozoic | Mesozoic Cenozoic | Cretaceous Tertiary): Sandstone, mudstone, claystone, and conglomerate; Denver is characterized by andesitic materials
Dolores Fm and Cutler Fm (Phanerozoic | Paleozoic Mesozoic | Permian Triassic): Red siltstone, sandstone, and conglomerate
Eocene prevolcanic sedimentary rocks (Phanerozoic | Cenozoic | Tertiary): South-central: Arkosic sand and bouldery gravel of Echo Park Alluvium. Southwest: includes Telluride Conglomerate and Blanco Basin Fm (arkosic mudstone, sandstone, and conglomerate)
Fountain Fm (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian Permian): Arkosic sandstone and conglomerate
Frontier Sandstone and Mowry Shale Members of Mancos Shale, and Dakota Sandstone (Phanerozoic | Mesozoic | Cretaceous): Locally includes, at base, Burro Canyon Fm (shale and sandstone) or, in western Moffat County, Cedar Mountain Fm (conglomerate and shale)
Hermosa Fm (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian): Arkosic sandstone, conglomerate, shale, and limestone; gypsum and salt in Paradox Member present in salt anticlines near Utah border
Huerfano Fm (Phanerozoic | Cenozoic | Tertiary): Shale and sandstone. Includes Farisita Conglomerate in northwestern Huerfano County
Ingleside Fm and Fountain Fm (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian Permian): Ingleside Fm: Limestone and calcareous sandstone. Fountain Fm: arkosic sandstone and conglomerate
Lodore Fm (Phanerozoic | Paleozoic | Cambrian): Sandstone, shale, and conglomerate
Lykins Lyons and Fountain Fms (Phanerozoic | Paleozoic Mesozoic | Carboniferous Pennsylvanian Permian(?) Triassic): Red siltstone, sandstone, and conglomerate
Middle Park Fm exclusive of Windy Gap Member (Phanerozoic | Cenozoic | Tertiary): Arkosic sandstone and conglomerate containing abundant volcanic materials. Arbitrary line between Middle Park and Coalmont Formations is at Continental Divide
Minturn Fm in west-central and south-central and other units (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian): Arkosic sandstone, conglomerate, shale, and limestone. Includes Madera Fm and Sharpsdale Fm of Chronic (1958) in Sangre de Cristo Range and Gothic Fm of Langenheim (1952) in Elk Mountains. Other units of Middle Pennsylvanian age.
North Park Fm (Phanerozoic | Cenozoic | Tertiary): Sandstone, siltstone, and conglomerate; in North Park and Laramie basin
Ogallala Fm (Phanerozoic | Cenozoic | Tertiary): Loose to well-cemented sand and gravel
Oligocene sedimentary rocks (Phanerozoic | Cenozoic | Tertiary): Northwest: includes Duchesne River Fm (sandstone and shale; includes some rocks of Eocene age) and Bishop Conglomerate near Utah border. South-central: includes Florissant Lake Beds (tuffaceous shale and tuff) and Antero Fm (lime
Poison Canyon Fm (Phanerozoic | Cenozoic | Tertiary): Arkosic conglomerate, sandstone, and shale
Quartzite, conglomerate, and interlayered mica schist (Proterozoic | Paleoproterozoic): Quartzite, conglomerate, and interlayered mica schist
Rico and Hermosa Fms (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian): Arkosic sandstone, conglomerate, shale, and limestone. Includes at base in some areas siltstone and shale of Molas Fm or Larsen Quartzite
Sangre de Cristo Fm (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian Permian): Arkosic conglomerate, sandstone, and siltstone
Santa Fe Fm (Phanerozoic | Cenozoic | Tertiary): Siltstone, sandstone, and conglomerate
Telluride conglomerate of Eocene prevolcanic sedimentary rocks (Te) and Cimarron Ridge Fm (Phanerozoic | Mesozoic Cenozoic | Cretaceous Tertiary): In northwestern San Juan Mountains. Cimarron Ridge Fm: volcanic breccia and conglomerate.
Uinta Mountain Group (Proterozoic | Mesoproterozoic): Quartzite, conglomerate, and shale
Upper part of Dawson Arkose (Phanerozoic | Cenozoic | Tertiary): Arkosic sandstone, conglomerate, and shale. Includes Green Mountain Conglomerate south of Golden
Weber Sandstone and Maroon Fm (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian Permian)
White River Fm or Group (Phanerozoic | Cenozoic | Tertiary): East: Ashy claystone and sandstone. Includes Castle Rock Conglomerate in region southeast of Denver. Northwest: Ashy claystone in North Park
Wingate Sandstone and Chinle Fm (Phanerozoic | Mesozoic | Triassic)

Connecticutt

Clough Quartzite (Silurian): Clough Quartzite - White, medium-grained, glassy to granular, well-layered quartzite and muscovitic quartzite, locally with garnet; conglomeratic (commonly with tourmaline) in lower part.
New Haven Arkose (Upper Triassic; possibly Lower Jurassic at top): New Haven Arkose - Red, pink, and gray coarse-grained, locally conglomeratic, poorly sorted and indurated arkose, interbedded with brick-red micaceous, locally shaly siltstone and fine-grained feldspathic clayey sandstone.

Georgia

Chilhowee Formation (Cambrian): Chilhowee Formation, includes Weisner Formation of Kesler, 1950
Conglomerate (Precambrian-Paleozoic): Conglomerate
Lookout Sandstone; Sewanee Sandstone (Pennsylvanian): Lookout Sandstone; Sewanee Sandstone
Pennsylvanian undifferentiated (Pennsylvanian): Pennsylvanian undifferentiated
Slate/ Quartzite/ Conglomerate (Precambrian-Paleozoic): Slate/ Quartzite/ Conglomerate

Idaho

Conglomerate, sandstone, and siltstone; Eocene to Late Cretaceous alluvial-fan deposits; east-central Idaho, Cordilleran fold-thrust belt, piggyback basins (Eocene to Late Cretaceous ): Lower Tertiary to Upper Mesozoic breccia, conglomerate and sandstone; syntectonic in part.
Sandstone, conglomerate, siltstone, tuff, claystone, limestone, and diatomite; Pliocene tuffaceous alluvial and lacustrine deposits; Snake River Plain and vicinity, southeastern Idaho (Pliocene ): Pliocene stream and lake deposits; may be due to volcanic and block-faulting events.
Shale, conglomerate, sandstone, siltstone, limestone, and chert; Mississippian turbidite flysch from a western source; central Idaho (Mississippian): Mississippian thrusted, shallow-to-deep marine detrital units of central Idaho.

Kentucky

Corbin Sandstone Member of Lee Formation (Pennsylvanian): Corbin Sandstone Member of Lee Formation
Lee Formation (Mississippian to Pennsylvanian ): Lee Formation
Rockcastle Sandstone Member of Lee Formation (Pennsylvanian): Rockcastle Sandstone Member of Lee Formation
Tuscaloosa Formation (Upper Cretaceous): Tuscaloosa Formation

Massachusetts

Ammonoosuc Volcanics (Middle Ordovician): Ammonoosuc Volcanics - Basal quartzite and conglomerate.
Bellingham Conglomerate (Pennsylvanian, Cambrian or Proterozoic Z): Bellingham Conglomerate - Red and gray metamorphosed conglomerate, sandstone, graywacke, and shale. Bellingham Conglomerate consists of conglomerate and lithic graywacke interbedded with chlorite phyllite and is confined to Bellingham basin. Also contains some volcanic rocks (rhyolite porphyry in roadcut on MA Hwy 146 at Premisy Hill west of Woonsocket, and felsite porphyry in the Franklin area east of Bellingham). Conglomerate contains pebbles of quartzite from adjacent Blackstone Group rocks and typical blue quartz of Milford Granite, so sediments are locally derived. Exposures on east side of Woonsocket Hill, southeast of Woonsocket, RI, show cliffs of steeply dipping, thin-bedded, white to gray quartzite of Blackstone Group standing above green schistose conglomerate containing many flattened white to gray quartzite pebbles and interbedded green calcareous quartz schist. Contact is probably a fault, but source of pebbles is quite obvious. In the same area, schist of Blackstone Group is difficult to distinguish from those of the Bellingham because of low-grade metamorphism of Blackstone rocks; it is probable that some of the low-grade Blackstone Rocks mapped northwest of Woonsocket in Blackstone River valley are part of Bellingham. The two rock units have been traditionally distinguished in the past by presence or absence of epidote (Warren and Powers, 1914), but this needs further study. Age is uncertain. Rocks have customarily been correlated with those of Pennsylvanian Narragansett basin; however, rocks in some exposures, such as the one at River St and Blackstone St in Woonsocket resemble Proterozoic Z Roxbury Conglomerate in Boston basin. Skehan and others (1979) suggest that Bellingham may have a similar age to that of Roxbury. This is supported by observation that Bellingham is a structural trough extending southwest from Boston basin and separating primarily Proterozoic Z granitoids from altered, but nongneissic, Proterozoic granitoids (Wones and Goldsmith, 1991). In deference to tradition, and because Proterozoic Z age has not been proven, age is shown on MA State bedrock map of Zen and others as Proterozoic Z to Pennsylvanian [map actually has age of Proterozoic Z, Cambrian, or Pennsylvanian, which differs from age stated in this report.] (Goldsmith, 1991).
Clough Quartzite (Upper Silurian): Clough Quartzite - Quartz-pebble conglomerate, quartzite, and minor mica schist and calc-silicate rocks. Fossils at Bernardston are similar to those at Croyden Mountain, New Hampshire which indicate late Llandoverian age. Parts of the Littleton and Partridge Formations, and Clough Quartzite in MA are here reassigned to the Rangeley Formation [here geographically extended to MA]. The four mapped areas of Clough Quartzite in the Amherst area west of the Connecticut Valley border fault are now interpreted as conglomerate lenses in the Rangeley. Clough is considered the key stratigraphic unit in Bronson Hill anticlinorium because 1) it is dominated by distinctive, readily recognizable rock types, 2) where present, it is base of Silurian-Devonian sequence, resting with detectable unconformity on older rocks, and 3) it contains late Llandoverian fossils at several localities in western NH and adjacent VT, and at Bernardston, MA. Consists mostly of quartz-pebble conglomerate in which pebbles are typically deformed; other lithologies are quartz grit or white to pink, well-bedded quartzite. Locally contains some mica schist beds. On the MA State bedrock geologic map (Zen and others, 1983), thickness is locally exaggerated because at many localities, the unit was only a few meters or less thick and could not be shown at a scale of 1:250,000. Maximum thickness is 200 m on west limb of Northfield syncline. Unconformably overlies Fourmile Gneiss in Pelham dome and in Kempfield anticline, or Ammonoosuc Volcanics over most gneiss domes. Partridge Formation occurs along Clough-Ammonoosuc contact as lenses in many areas (Hatch and others, 1988).
Dalton Formation (Lower Cambrian and Proterozoic Z): Dalton Formation - Tan to orangish-tan quartz and gneiss cobble and pebble conglomerate, rusty feldspathic schist, and lustrous greenish-gray muscovite quartz schist.
Dighton Conglomerate (Upper Pennsylvanian): Dighton Conglomerate - Coarse conglomerate having sandy matrix; minor sandstone. Dighton Conglomerate occurs in Narragansett basin. Consists of gray conglomerate composed mainly of rounded quartzite cobbles to boulders containing subordinate rounded granite cobbles and slate pebbles; very little sand matrix; lenses of medium-grained sandstone form less than 20 percent of unit. Age is Pennsylvanian (Goldsmith, 1991).
East Berlin Formation (Lower Jurassic): East Berlin Formation - Pale red conglomerate and arkosic sandstone. Assigned to Newark Supergroup (Robinson and Luttrell, 1985).
Harvard Conglomerate (Pennsylvanian): Harvard Conglomerate - Conglomerate and chloritoid-hematite phyllite.
Hoosac Formation (Lower Cambrian and Proterozoic Z): Hoosac Formation - Gray conglomerate containing pebbles of albite and blue quartz, and boulders of gneiss.
Hoosac Formation (Lower Cambrian and Proterozoic Z): Hoosac Formation - Light-gray, albite-biotite granofels and schist, pseudoconglomerate and blue quartz pebble conglomerate.
Mount Toby Formation (Lower Jurassic): Mount Toby Formation - Pale red conglomerate and arkosic sandstone, coarsens eastward. The Mount Toby Conglomerate is here revised and renamed the Mount Toby Formation of the Newark Supergroup. It includes only the sedimentary strata in the Deerfield basin above the slump zone unconformity defined by Cornet (1977), or its projected equivalent at its contact with the underlying Turners Falls Sandstone. It includes conglomerates at the type locality, landslide deposits within the conglomerate, and sandstone and lake beds above the slump zone unconformity, which were formerly included in the Turners Falls Sandstone. Other rocks mapped as Mount Toby Conglomerate by Emerson (1898) in the Hartford, Deerfield, and Northfield basins have been assigned to the Portland, Sugarloaf, and Turners Falls Formations. Age is Sinemurian and Pliensbachian, based on the discovery by Cornet (1977) of palynoflora in these strata (Robinson and Luttrell, 1985).
Nassau Formation (Lower Cambrian and Proterozoic Z): Nassau Formation - Rensselaer Graywacke Member - Greenish-gray, plagioclase-rich, blue quartz pebble metagraywacke and minor gneiss-cobble conglomerate.
Pondville Conglomerate (Lower Pennsylvanian): Pondville Conglomerate - Quartz conglomerate having abundant sandy matrix; boulder conglomerate, arkose; fossil plants. Pondville Conglomerate is present in Narragansett and Norfolk basins. Although Chute (1964, 1966, 1969) recognized a lower boulder conglomerate member and an upper sandstone to pebble conglomerate member in the Pondville in the northeast part of the basin, such a division is not readily made to the southwest because of facies changes. Upper member grades into and interfingers with Wamsutta Formation. Basal beds nonconformably overlie Dedham Granite in northern part of Narragansett basin. Age of deposits in Narragansett and Norfolk basins ranges from Early to Late Pennsylvanian; however, Skehan and Murray (1980) assigned lower part of Pondville to Mississippian. Further study may reveal even older Paleozoic sediments in Narragansett basin (Goldsmith, 1991).
Portland Formation (Lower Jurassic): Portland Formation - Reddish-brown to pale red conglomerate and arkose.
Red arkosic conglomerate, sandstone, and siltstone (Upper Triassic): Red arkosic conglomerate, sandstone, and siltstone - In Essex County.
Roxbury Conglomerate (Proterozoic Z to earliest Paleozoic): Roxbury Conglomerate - Conglomerate, sandstone, siltstone, argillite, and melaphyre. Consists of Brookline, Dorchester, and Squantum Members. Roxbury Conglomerate forms base of Boston Bay Group. Divided into Brookline, Dorchester, and Squantum Members. Conglomerate in Brookline Member contains clasts of Dedham Granite, quartzite (possibly from Westboro Formation), and volcanic rock from underlying Mattapan Volcanic Complex. Dorchester Member consists of interbedded argillite and sandstone and forms an intermediate unit between Brookline Member and overlying Cambridge Argillite. Uppermost Squantum Member is a distinctive diamictite which appears to pinch out in northern part of basin. Brighton Melaphyre lies within Brookline Member and consists of mafic volcanic rocks (quartz keratophyre, keratophyre, and spilite). Roxbury clearly lies nonconformably on Dedham Granite near Hull, MA; can be traced continuously over Mattapan Volcanic Complex. Age is Proterozoic Z and possibly Early Cambrian (Goldsmith, 1991).
Shuttle Meadow Formation (Lower Jurassic): Shuttle Meadow Formation - Pale red conglomerate and arkosic sandstone. The Shuttle Meadow Formation is assigned to Newark Supergroup and is extended into MA in the Hartford basin. It consists of sandstone strata containing one interval of gray mudstone beds. The unit grades eastward along strike into a conglomeratic facies. It overlies the New Haven Arkose or Hitchcock Volcanics and underlies the Holyoke Basalt (Robinson and Luttrell, 1985).
Sugarloaf Formation (Lower Jurassic): Sugarloaf Formation - Pale red conglomerate and arkosic sandstone, coarsens eastward.
Turner Falls Sandstone (Lower Jurassic): Turner Falls Sandstone - Pale red conglomerate and arkosic sandstone.
Wamsutta Formation (Middle and Lower Pennsylvanian): Wamsutta Formation - Red to pink, well-sorted conglomerate, graywacke, sandstone, and shale; fossil plants. Wamsutta Formation occurs in Narragansett and Norfolk basins. Consists of conglomerate, lithic graywacke, sandstone, and shale. Also contains rhyolite and basalt horizons near Attleboro. Northwest of Attleboro, Wamsutta overlies Diamond Hill Felsite as used by Skehan and Murray (in Skehan and others, 1979). Volcanic rocks similar to Diamond Hill Felsite crop out west of Lake Pearl, between Franklin and Wrentham, on west flank of Norfolk basin. These are shown within Wamsutta Formation on MA State bedrock map of Zen and others (1983) because of their proximity to Diamond Hill. They also resemble Proterozoic Z Mattapan Volcanic Complex. Chute (1966) described lenses of carbonate rock in red and green shale in Wamsutta in Norwood quad. Limestone also observed in rocks mapped as Wamsutta adjacent to exposed Dedham Granite at Manchester Pond Reservoir (J.P. Schafer, 1982, oral commun.). Red and green shales may actually be Cambrian. Upper member of Pondville Conglomerate grades into and interfingers with Wamsutta; in turn, Wamsutta interfingers with Rhode Island Formation in northwest part of Narragansett basin. Nonconformably overlies Dedham Granite. Partly equivalent to Rhode Island Formation. Age is Early and Middle Pennsylvanian. Contains a few plant fossils (Goldsmith, 1991).
Washington Gneiss (Proterozoic Y): Washington Gneiss - Rusty-weathering, muscovite-biotite-sillimanite and/or kyanite-garnet schist; blue-quartz ribbed conglomerate, interlayered garnet-plagioclase-quartz metadacite.

Maryland

Chilhowee Group; Weverton Formation (Late Precambrian - Cambrian): Weverton Formation - Interbedded white to dark gray, thin-bedded, micaceous, ferruginous, and sericitic quartzites, phyllites, and white, thick-bedded, ledge-making quartzites; some gray to brown ferruginous quartz conglomerate and purple-banded phyllite; thickness approximately 100 feet in south, increases to 425 feet in north.
Conococheague Limestone (Upper Cambrian to Lower Ordovician ): Conococheague Limestone - Dark blue, laminated, oolitic, argillaceaous, and siliceous limestone, algal limestone, and flat-pebble conglomerate; siliceous shale partings; some sandstone and dolomite; thickness 1,600 to 1,900 feet.
New Oxford Formation, basal liimestone conglomerate (Triassic): New Oxford Formation - basal conglomerate member: From vicinity of Maryland Rte. 73 and southward, limestone conglomerate with red and gray calcareous matrix
New Oxford Formation, basal quartz conglomerate (Triassic): New Oxford Formation - basal conglomerate member: From vicinity of Maryland Rte. 73 northward, quartz conglomerate with red sandy matrix

Maine

Carboniferous - Devonian unnamed conglomerate and sandstone (Carboniferous and/or Devonian): Carboniferous - Devonian unnamed conglomerate and sandstone
Devonian - Silurian Bar Harbor Formation (Devonian - Silurian): Devonian - Silurian Bar Harbor Formation
Devonian - Silurian Bell Brook Formation, conglomerate member (Devonian - Silurian): Devonian - Silurian Bell Brook Formation, conglomerate member
Devonian - Silurian Daggett Ridge Formation (Devonian - Silurian): Devonian - Silurian Daggett Ridge Formation
Devonian - Silurian Towow Formation conglomerate (Devonian - Silurian): Devonian - Silurian Towow Formation conglomerate
Devonian - Silurian unnamed conglomerate (Devonian - Silurian): Devonian - Silurian unnamed conglomerate
Devonian Hobbstown Formation (Devonian): Devonian Hobbstown Formation
Devonian Mapleton Formation (Devonian): Devonian Mapleton Formation
Devonian Perry Formation sandstone member (Devonian): Devonian Perry Formation sandstone member
Devonian Seboomook Formation Day Mountain member conglomerate (Devonian): Devonian Seboomook Formation Day Mountain member conglomerate
Devonian Seboomook Formation Temple Stream member (Silurian-Devonian): Devonian Seboomook Formation Temple Stream member
Devonian Seboomook Formation unnamed conglomerate (Devonian): Devonian Seboomook Formation unnamed conglomerate
Devonian Trout Valley Formation (Devonian): Devonian Trout Valley Formation
Devonian unnamed conglomerate (Devonian): Devonian unnamed conglomerate
Devonian unnamed limestone conglomerate (Devonian): Devonian unnamed limestone conglomerate
Devonian unnamed lithic sandstone and conglomerate (Devonian): Devonian unnamed lithic sandstone and conglomerate
Megunticook Formation, Polymictic Conglomerate Member (Ordovician - Cambrian): Megunticook Formation, Polymictic Conglomerate Member
Ordovician - Cambrian Mount Battie Formation (Ordovician - Cambrian): Ordovician - Cambrian Mount Battie Formation
Ordovician Chase lake Formation conglomerate member (Ordovician): Ordovician Chase lake Formation conglomerate member
Ordovician Chase lake formation (Ordovician): Ordovician Chase lake formation
Ordovician Lobster Mountain volcanic complex (Ordovician): Ordovician Lobster Mountain volcanic complex
Ordovician sandstone and pelite of the Depot Mountain sequence (Ordovician): Ordovician sandstone and pelite of the Depot Mountain sequence
Precambrian Z Rockport Formation (Precambrian): Precambrian Z Rockport Formation
Silurian - Ordovician Mars Hill Conglomerate (Silurian - Ordovician): Silurian - Ordovician Mars Hill Conglomerate
Silurian - Ordovician unnamed conglomerate (Silurian - Ordovician): Silurian - Ordovician unnamed conglomerate
Silurian Ames Knob formation (Silurian): Silurian Ames Knob formation
Silurian Capens Formation (Silurian): Silurian Capens Formation
Silurian Frenchville Formation (Silurian): Silurian Frenchville Formation
Silurian Oak Bay formation (Silurian): Silurian Oak Bay formation
Silurian Rangeley Formation "A" member lithic sandstone" (Silurian): Silurian Rangeley Formation "A" member lithic sandstone
Silurian Rangeley Formation "A""member (Silurian): Silurian Rangeley Formation "A" member
Silurian Rangeley Formation "B" member (Silurian): Silurian Rangeley Formation "B" member"
Silurian Rangeley Formation "C" member (Silurian): Silurian Rangeley Formation "C" member
Silurian Sangerville Formation conglomerate member (Silurian): Silurian Sangerville Formation conglomerate member
Silurian undifferentiated conglomerates and coarse-grained sandstones (Silurian): Silurian undifferentiated conglomerates and coarse-grained sandstones, in part of the Allsbury Formation and in part unnamed
Silurian unnamed conglomerate (Silurian): Silurian unnamed conglomerate
Silurian unnamed conglomerate and sandstone (Silurian): Silurian unnamed conglomerate and sandstone

Michigan

Copper Harbor Conglomerate (Middle Proterozoic): Copper Harbor Conglomerate - Red lithic conglomerate and sandstone; mafic to felsic volcanic flows similar to those of the unnamed formation (unit Yu) are interlayered with the sedimentary rocks.
Menominee Group; Blair Creek Formation (Early Proterozoic): Menominee Group; Blair Creek Formation - Dominantly dark-gray, massive, porphyritic tholeiitic basalt. Includes a basal conglomerate and a lean iron-formation in middle of formation
Munising Formation (Late Cambrian): Munising Formation
Oronto Group; Freda Sandstone; Conglomerate member (Middle Proterozoic): Oronto Group; Freda Sandstone; Conglomerate member

Minnesota

Animikie Group; Iron-formation - Iron-formation (Early Proterozoic): Animikie Group; Iron-formation - Includes the Gunflint Iron Formation in Cook County and the Biwabik Iron Formation and subjacent units of arenite and conglomerate assigned to the Pokegama Quartzite in Itasca, St. Louis, and Lake Counties. Also includes thin lenses of iron-formation (Remer Member) in the Virginia Formation in Itasca County.
Coleraine Formation (Cretaceous): Coleraine Formation - Jasper-pebble conglomerate, sandstone, and shale of diverse origin on the Mesabi range of northern Minnesota, and unnamed sandstone and shale of nonmarine to marine origin in east-central Minnesota
Sioux Quartzite (Early Proterozoic): Sioux Quartzite - Red quartzite of fluvial to possibly marginally marine origin. Includes quartz-pebble conglomerate, claystone (catlinite, also called pipestone), a basal (rhyolite) pebble conglomerate in Pipestone County, and a basal (granite, quartz, chert, iron-formation) conglomerate in Nicollet County on the Minnesota River

Montana

Arikaree formation (Phanerozoic | Cenozoic | Tertiary): Arikaree formation: gray sandstone with layers of concretions; contains volcanic ash and, locally, channels filled with conglomerate; known only in southeastern Montana.
Horsethief sandstone (Phanerozoic | Mesozoic | Cretaceous-Late): Horsethief sandstone: shaly sandstone grading upward into massive brownish cliff-forming sandstone with local concentrations of magnetite in beds near top.

North Carolina

Alligator Back Formation; Gneiss (Late Proterozoic): Gneiss - finely laminated to thin layered; locally contains massive gneiss and micaceous granule conglomerate; includes schist, phyllite, and amphibolite.
Castle Hayne Formation; Comfort Member and New Hanover Member, undivided (Tertiary): Comfort Member and New Hanover Member, undivided - Comfort Member: bryozoan-echinoid skeletal limestone, locally dolomitized, solution cavities common. New Hanover Member: phosphate-pebble conglomerate, micritic, thin; restricted to basal part of Castle Hayne Formation in southeastern counties.
Newark Supergroup, Chatham Group; Chatham Group, Undivided (Triassic): Chatham Group, Undivided - conglomerate, fanglomerate, sandstone, and mudstone. Conglomerate and fanglomerate shown by pattern.
Newark Supergroup, Chatham Group; Pekin Formation (Triassic): Pekin Formation - conglomerate, sandstone, and mudstone.
Newark Supergroup, Chatham Group; Sanford Formation (Triassic): Sanford Formation - conglomerate, fanglomerate, sandstone, and mudstone.
Newark Supergroup, Dan River Group; Dan River Group, Undivided (Triassic): Dan River Group, Undivided - basin-margin conglomerate and sandstone, red to brown, interfingering with basin-center sandstone and mudstone, green to brown. Conglomerate shown by pattern.
Newark Supergroup, Dan River Group; Pine Hall Formation (Triassic): Pine Hall Formation - sandstone, mudstone, and conglomerate, yellowish orange to brown.
Newark Supergroup, Dan River Group; Stoneville Formation (Triassic): Stoneville Formation - conglomerate, sandstone, and mudstone, lenticular and laterally-gradational bedding.

Nebraska

Arikaree Group (Phanerozoic | Cenozoic | Tertiary | Oligocene Miocene): Consists mainly of gray, fine, loose to compact sand that has layers of hard, fine-grained dark-gray concretions which vary from few in to 15 in and often have tabular form. Includes a large amount of volcanic ash mixed in with the sand. Contains a number of channels filled with coarse conglomerate along ridge south of North Platte River. About 500 ft thick.

New Hampshire

Member C (uppermost) of the Rangeley Formation in Maine and northeastern and southwestern New Hampshire (Lower Silurian (Llandoverian)): Member C (uppermost) of the Rangeley Formation in Maine and northeastern and southwestern New Hampshire - Quartz-pebble conglomerate overlain by rusty metapelite and feldspathic quartzite.

New Jersey

Basalt-clast Conglomerate (Lower Jurassic): Basalt-clast Conglomerate - Dark to very-dark-gray conglomerate with clasts mostly of sub-angular to subrounded greenish-black basalt cobbles and boulders. Other clasts (about 10 to 15%) are pebbles to boulders of hornblende granite with pink feldspar. Matrix is dark-pinkish-gray arkosic sand. Locally onlaps the Hook Mountain Basalt along the Ramapo Fault in northeast part of map area. Maximum thickness of unit unknown.
Feltville Formation Conglomerate and Sandstone facies (Lower Jurassic): Feltville Formation Conglomerate and Sandstone facies - Near Oakland, subrounded pebbles to cobbles of quartzite and quartz in a red siltstone and sandstone matrix (Jfc) interfinger with sandstone and siltstone of the Feltville Formation.
Green Pond Conglomerate (Lower (?) and Middle Silurian): Green Pond Conglomerate (Rogers, 1836) - Medium- to coarse-grained quartz-pebble conglomerate, quartzitic arkose and orthoquartzite, and thin- to thick-bedded reddish-brown siltstone. Grades downward into gray, very dark-red, or grayish-purple, medium- to coarse-grained, thin- to very thick bedded pebble to cobble conglomerate containing clasts of red shale, siltstone, and chert; yellowish-gray sandstone and chert; dark-gray shale and chert; and white-gray and pink milky quartz. Quartz cobbles are as long as 10 cm (4 in.), and rare red shale clasts as much as 46 cm (18 in.) across. Milky quartz pebbles average 2.5 cm (1 in.) in length. Red arkosic quartz-pebble conglomerate and quartzite are more abundant than gray and grayish-green quartzite. Unconformably overlies Martinsburg Formation, Allentown Dolomite, Leithsville Formation, or Proterozoic rocks. About 305 m (1000 ft) thick.
Hardyston Quartzite (Lower Cambrian): Hardyston Quartzite (Lower Cambrian) (Wolff and Brooks, 1898) - Light- to medium-gray and bluish-gray conglomeratic sandstone. Varies from pebble conglomerate, to fine-grained, well-cemented quartzite, to arkosic or dolomitic sandstone. Conglomerate contains subangular to subrounded white quartz pebbles up to 2.5 cm (1 in.). Lower contact unconformable. About 0 to 9 m (1-30 ft) thick.
Hardyston Quartzite (Lower Cambrian): Hardyston Quartzite (Wolff and Brooks, 1898) - Medium- to light-gray, fine- to coarse-grained, medium- to thick-bedded quartzite, arkosic sandstone and dolomitic sandstone. Basal pebble to cobble conglomerate typically contains clasts of local basement affinities. Contains fragments of the trilobite Olenellus thompsoni of Early Cambrian age. Thickness approximately 0.5 to 62 m (1.6-200 ft).
Jacksonburg Limestone (Middle Ordovician): Jacksonburg Limestone (Kummel, 1908; Miller, 1937) - Upper part is medium- to dark-gray, laminated to thin-bedded shaly limestone and less abundant medium-gray arenaceous limestone containing quartz-sand lenses. Upper part thin to absent to northeast. Lower part is interbedded medium- to dark-gray, fine- to medium-grained, very thin to medium-bedded fossiliferous limestone and minor medium- to thick-bedded dolomite-cobble conglomerate having a limestone matrix. Unconformable on Beekmantown Group and conformable on the discontinuous sequence at Wantage in the Paulins Kill area. Contains conodonts of North American midcontinent province from Phragmodus undatus to Aphelognathus shatzeri zones of Sweet and Bergstrom (1986). Thickness ranges from 41 to 244m (135-800 ft).
Lockatong Formation - Conglomerate facies (Upper Triassic): Lockatong Formation Sandstone and Conglomerate Sandstone facies - Unit Trla interfingers laterally and gradationally with quartz sandstone and conglomerate (Trls) and quartzite conglomerate (Trlcq) near Triassic border fault in southwestern area of map.
Lockatong Formation - Sandstone and Conglomerate facies (Upper Triassic): Sandstone and Conglomerate Sandstone facies - Unit Trla interfingers laterally and gradationally with quartz sandstone and conglomerate (Trls) and quartzite conglomerate (Trlcq) near Triassic border fault in southwestern area of map.
Passaic Formation Conglomerate and Sandstone facies (Lower Jurassic and Upper Triassic): Passaic Formation Conglomerate and Sandstone facies - Conglomeratic sandstone (JTrpsc) is brownish-red pebble conglomerate, medium- to coarse-grained, feldspathic sandstone and micaceous siltstone; unit is planar to low-angle trough cross laminated, burrowed, and contains local pebble layers. Unit forms upward-fining sequences 0.5 to 2.5 m (1.6-8 ft) thick. Conglomeratic sandstone thickness exceeds 800 m (2,625 ft).
Passaic Formation Limestone-clast Conglomerate facies (Lower Jurassic and Upper Triassic): Passaic Formation Limestone-clast Conglomerate facies - Limestone conglomerate unit (JTrpcl) is medium-bedded to massive, pebble to boulder conglomerate. Clasts are subangular dolomitic limestone in matrix of brownish- to purplish-red sandstone to mudstone; matrix weathers light-gray to white near faults. Maximum thickness unknown.
Passaic Formation Quatzite-clast Conglomerate facies (Lower Jurassic and Upper Triassic): Passaic Formation Quartzite-clast Conglomerate facies - Quartzite conglomerate unit (JTrpcq) is reddish-brown pebble conglomerate, pebbly sandstone, and sandstone, in upward-fining sequences 1 to 2 m (3-6 ft) thick. Clasts are subangular to subrounded, quartz and quartzite in sandstone matrix. Sandstone is medium to coarse grained, feldspathic (up to 20 percent feldspar), and locally contains pebble and cobble layers. Conglomerate thickness exceeds 850 m (2,790 ft).
Quartz-pebble Conglomerate (Lower Jurassic): Quartz-pebble Conglomerate - Reddish-brown to brownish-purple, fine-grained sandstone, siltstone, and mudstone; sandstone commonly micaceous, interbedded with siltstone and mudstone in fining-upward sequences mostly 1.5 to 4 m (5-13 ft) thick. Red, gray and brownish-purple siltstone and black, blocky, partly dolomitic siltstone and shale common in lower part. Irregular mudcracks, symmetrical ripple marks, and burrows, as well as gypsum, glauberite, and halite pseudomorphs are abundant in red mudstone and siltstone. Gray, fine-grained sandstone may have carbonized plant remains and reptile footprints in middle and upper parts of unit. Near Morristown, beds of quartz-pebble conglomerate (unit Jbcq) as much as 0.5 m (1.6 ft) thick interfinger with beds of sandstone, siltstone, and shale. Northeast of Boonton, beds of quartz-pebble conglomerate (not mapped separately as Jbcq) occur locally with conglomerate containing abundant clasts of gneiss and granite in matrix of reddish-brown sandstone and siltstone. Maximum thickness is about 500 m (1,640 ft).
Shawangunk Formation (Middle and Lower Silurian): Shawangunk Formation (Mather, 1840; Epstein and Epstein, 1972) - Upper part is medium- to medium-dark-gray, or dark-greenish-gray, medium- to thick-bedded sandstone and pebble conglomerate having well rounded grains, some of which are limonite stained. Conglomerate consists of matrix-supported quartz and subordinate shale pebbles as long as 5 cm (2 in.) in poorly to well-sorted, planar tabular to trough crossbedded sandstone. Local black to dark-greenish-gray, thin-bedded shale near upper contact. Middle part, occurring in southwest and sporadically in northeast, is light- to medium-dark-gray, greenish-gray, interbedded thin- to medium-bedded, planar tabular to trough cross-bedded shale and sandstone. Grains are well rounded and moderately to well sorted. Contains sparse graphite flakes. Lower part is light- to medium-gray to light-olive-gray, thin- to thick-bedded quartz and feldspathic sandstone, quartzite, and quartz-pebble conglomerate, which is matrix-supported, poorly to well sorted, cross to planar bedded. Clasts are primarily quartz and sparse dark-gray argillite and black chert. Sandstone is feldspathic and locally approaches an arkose in compostion. Lower contact unconformable and, at places, is a fault of small displacement. Thickness approximately 427 m (1,400 ft).
Skunnemunk Conglomerate (Middle Devonian): Skunnemunk Conglomerate (Darton, 1894) - Grayish-purple to grayish-red, thin- to very thick bedded, locally cross-bedded, polymictic conglomerate and sandstone containing clasts of white vein quartz, red and green quartzite and sandstone, red and gray chert, and red shale; interbedded with medium-gray, thin-bedded sandstone and greenish-gray and grayish-red, mud-cracked shale. Conglomerate and sandstone matrix is primarily hematite and microcrystalline quartz. Conglomerate cobbles range to 16.5 cm (6.5 in) long, and average cobble size increases in upper part of unit. Lower contact conformable and gradational as defined by Kummel and Weller (1902). About 915 m (3,000 ft) thick.
Stockton Formation Cobble Conglomerate and Sandstone facies (Upper Triassic): Stockton Formation Cobble Conglomerate and Sandstone facies - Predominantly medium- to coarse-grained, light-gray, light-grayish-brown, or yellowish- to pinkish-gray arkosic sandstone and medium- to fine-grained, violet-gray to reddish-brown arkosic sandstone; with lesser, reddish to purplish-brown, silty mudstone, argillaceous siltstone, and shale. Some coarse-grained sandstone in lower part contains thick beds of conglomerate (Trsc) which have been mapped in the vicinity of Stockton. Sandstone, deposited in high-gradient stream channels, is mostly planar bedded with scoured bases containing pebble lags and mudstone rip-up clasts. Upper part of channel beds are burrowed. Large-scale trough crossbeds occur in some very coarse grained sandstone beds; smaller scale trough and climbing-ripple cross lamination occur in the upper part of channel sequences and in finer grained sandstone beds. Typical floodplain mudstones are irregularly thin bedded and extensively burrowed. Floodplain beds are thicker and more numerous in the central Newark basin, near the Delaware River. Thickness of the unit (including Trsc) near Stockton is about 1,240 m (4,068 ft).
Stockton Formation Cobble Conglomerate and Sandstone facies (Upper Triassic): Stockton Formation Cobble Conglomerate and Sandstone facies - Unit is coarser near Newark basin border fault, where poorly exposed, reddish-brown to pinkish-white, medium- to coarse-grained, feldspathic pebbly sandstone and conglomerate (Trss) and pebble to cobble quartzite conglomerate (Trscq).
Stockton Formation Cobble Conglomerate and Sandstone facies (Upper Triassic): Stockton Formation Cobble Conglomerate and Sandstone facies - Unit is coarser near Newark basin border fault, where poorly exposed, reddish-brown to pinkish-white, medium- to coarse-grained, feldspathic pebbly sandstone and conglomerate (Trss) and pebble to cobble quartzite conglomerate (Trscq).
Towaco Formation Conglomerate and Sandstone facies (Lower Jurassic): Towaco Formation Conglomerate and Sandstone facies - Conglomerate and conglomeratic sandstone with subrounded quartzite and quartz clasts in matrix of light-red sand to brownish-red silt (Jtc) interfingers with rocks of the Towaco Formation north and west of New Vernon.

New Mexico

Abo Formation, lower part (Phanerozoic | Paleozoic | Permian): Lower part of Abo Formation; Wolfcampian, and in part Virgilian ?
Bull Canyon Formation of Chinle Group (Phanerozoic | Mesozoic | Triassic): Bull Canyon Formation; Norian
Fence Lake Formation (Phanerozoic | Cenozoic | Tertiary): Fence Lake Formation; conglomerate and conglomeratic sandstone, coarse fluvial volcanoclastic sediments, minor eolian facies, and pedogenic carbonates of the southern Colorado Plateau region; Miocene
Garita Creek Formation of Chinle Group (Phanerozoic | Mesozoic | Triassic): Garita Creek Formation; Carnian
Gila Group (Phanerozoic | Cenozoic | Tertiary Quaternary): Gila Group. Includes Mimbres Formation and several informal units in southwestern basins; Middle Pleistocene to uppermost Oligocene
Hueco Formation (Phanerozoic | Paleozoic | Permian): Hueco Formation; limestone unit restricted to south-central area; Pendejo Tongue divides Abo Formation into upper and lower parts; Wolfcampian
Moenkopi Formation (Phanerozoic | Mesozoic | Triassic): Moenkopi Formation; Middle Triassic
Nacimiento Formation (Phanerozoic | Cenozoic | Tertiary): Nacimiento Formation; Paleocene, San Juan Basin
Ojo Alamo Formation (Phanerozoic | Cenozoic | Tertiary): Ojo Alamo Formation; Paleocene, San Juan Basin
Santa Rosa Formation of Chinle Group (Phanerozoic | Mesozoic | Triassic): Santa Rosa Formation; Carnian; includes Moenkopi Formation (Middle Triassic) at base in most areas

Nevada

Antler Sequence of Silberling and Roberts (1962) (Pennsylvanian to Late Permian ): ANTLER SEQUENCE OF SILBERLING AND ROBERTS (1962) (Middle Pennsylvanian to Early or Late Permian) (Guadalupian)-Conglomerate, sandy to conglomeratic limestone, limestone, sandstone, and calcareous shale. Thin detrital and carbonate sequence within main part of Antler orogenic belt. Includes units such as Sunflower Formation of Bushnell (1967) in Elko County, Battle Formation, Antler Peak Limestone, and Edna Mountain Formation in Lander and western Eureka Counties, and Wildcat Peak Formation in northern Nye County
Continental deposits of siltstone, shale, conglomerate, and limestone (Cretaceous): CONTINENTAL DEPOSITS OF SILTSTONE, SHALE, CONGLOMERATE, AND LIMESTONE-Includes units such as King Lear Formation in Humboldt County, Newark Canyon Formation in Eureka County, Willow Tank Formation and baseline Sandstone in Clark County
Continental sedimentary rocks (Late Cretaceous to Early Miocene): CONTINENTAL SEDIMENTARY ROCKS-Clark County
Continental sedimentary rocks (Late Cretaceous to Eocene): CONTINENTAL SEDIMENTARY ROCKS-Includes units such as Pansy Lee Conglomerate in Humboldt County, part of Cretaceous(?) and Tertiary rocks of Kleinhampl and Ziony (1967) in northern Nye County, and part of "older clastic rocks" of Tschanz and Pampeyan (1970) in Lincoln County
Dunlap Formation (Early Jurassic to Middle Jurassic): DUNLAP FORMATION (Lower and Middle Jurassic)-Conglomerate, sandstone, greenstone, felsite, and tuff. Locally contemporaneous with folding and thrusting. Mineral County and adjacent parts of Esmeralda and Nye Counties
Limestone, cherty limestone, sandy limestone, and chert-pebble conglomerate (Pennsylvanian): LIMESTONE, CHERTY LIMESTONE, SANDY LIMESTONE, AND CHERT-PEBBLE CONGLOMERATE (Lower and Middle Pennsylvanian)-Includes units such as Moleen and Tomera Formations of Dott (1955)
Massive limestone (Mississippian): MASSIVE LIMESTONE-In the San Antonio Mountains, western Nye County
Sandy and silty limestone, conglomerate, and siltstone (Pennsylvanian to Late Permian): SANDY AND SILTY LIMESTONE, CONGLOMERATE, AND SILTSTONE (Upper Pennsylvanian to Upper Permian)-Includes units such as Strathearn Formation of Dott (1955) and Buckskin Mountain, Beacon Flat, and Carlin Canyon Formations of Dott (1955)
Sedimentary rocks (Late Cretaceous to Oligocene): SEDIMENTARY ROCKS-Includes Sheep Pass Formation (Eocene) and related units and unnamed tuffaceous sedimentary rocks

New York

Brunswick Formation (Upper Triassic): Brunswick Formation - sandstone and conglomerate.
Brunswick Formation, undivided (Upper Triassic): Brunswick Formation, undivided - includes the units: TRbg: sandstone and conglomerate; TRbs: sandstone, siltstone, mudstone; TRba: mudstone, sandstone, and arkose.
Connoquenessing and Sharon Formations (Lower Pennsylvanian): Connoquenessing and Sharon Formations - sandstone, shale; Sharon Formation-shale, sandstone, conglomerate; Olean Conglomerate 50-100 ft. (15-30 m).
Cuyahoga and Knapp Formations (Lower Mississippian): Cuyahoga and Knapp Formations - Cuyahoga Formation-shale, sandstone; Corry Sandstone; Knapp Formation-shale, conglomerate 60-100 ft. (20-30 m).
Germantown Formation (Cambrian): Germantown Formation - south of Troy; shale, conglomerate, limestone.
Germantown Formation (Cambrian): Germantown Formation - shale, limestone, conglomerate.
Hammer Creek Formation (Upper Triassic): Hammer Creek Formation - conglomerate.
Lower Walton Formation (Upper Devonian): Lower Walton Formation - shale, sandstone, conglomerate.
Lower Walton Formation (Upper Devonian): Lower Walton Formation - shale, sandstone, conglomerate.
Oneonta Formation (Middle - Upper Devonian): Oneonta Formation - shale, sandstone, conglomerate.
Poughquag Quartzite (Cambrian): Poughquag Quartzite - (includes local Dalton Formation at base)-locally conglomeratic.
Quassaic Quartzite (Upper Ordovician): Quassaic Quartzite - quartzite, sandstone, conglomerate.
Slide Mountain Formation (Upper Devonian): Slide Mountain Formation - sandstone, shale, conglomerate.
Slide Mountain Formation (Upper Devonian): Slide Mountain Formation - sandstone, shale, conglomerate.
Slide Mountain Formation (Upper Devonian): Slide Mountain Formation - sandstone, shale, conglomerate.
Stockton Formation (Upper Triassic): Stockton Formation - arkose, conglomerate, and mudstone.
Upper Walton Formation (Upper Devonian): Upper Walton Formation - shale, sandstone, conglomerate.
Upper Walton Formation (Upper Devonian): Upper Walton Formation - shale, sandstone, conglomerate.

Ohio

Black Hand Sandstone Member of Cuyahoga Formation (Mississippian): Black Hand Sandstone Member of Cuyahoga Formation - Sandstone and conglomerate; yellow-gray to white, weathers shades yellow, brown, red, and gray; very fine grained to pebbles, mostly medium to coarse grained with lenses and layers of pebbles; massive to crossbedded to laminated; grades laterally into shale and siltstone; quartzose.

Oklahoma

Arkansas Novaculite (Phanerozoic | Paleozoic | Silurian Devonian(?) Carboniferous Mississippian-Early ): McALESTER TEXARKANA- Chert, fine- to very fine-grained, gray, green, tan, black, white, and pink, with interbedded black to gray shale in 1-to 18-inch beds; some interbedded conglomerates and in places a basal conglomerate; upper part has been determined to be Mississippian in age and lower part to be Early Silurian, on basis of examination of palynomorphs from Potato Hills; thickness, 600 feet or more. Occurs in the OUACHITA MTNS SOUTH OF TI VALLEY FAULT.
Carlton Rhyolite Group (Phanerozoic | Paleozoic | Cambrian-Middle): CLINTON- Rhyolite flows and tuffs; about 4,500 feet thick; one outlier is shown in southern part of mapped area. LAWTON- Rhyolite flows, tuffs, conglomerate beds, and diabase sills; thickness, 4,500 feet (1,370 m).
Chickasha Formation (Phanerozoic | Paleozoic | Permian ): WOODWARD- The "Chickasha Formation" member of Flower Pot Shale (Pc) is a deltaic tongue of red-brown to greenish-gray to orange-brown cross-bedded mudstone conglomerate, siltstone, shale, and fine-grained sandstone, about 30 feet thick, in the middle of the Flowerpot Shale, pinching out northward. CLINTON- "Chickasha Formation," Pc, reddish-brown to maroon mudstone conglomerate with some shale, silstone, and fine- to coarse-grained sandstone; thickness, about 600 feet; gradational northward and westward into the Flowerpot Shale and the Blaine Formation and westward into Dog Creek Shale. OKLAHOMA CITY-Variegated mudstone conglomerate and red-brown to orange- brown silty shale and siltstone, with minor amounts of orange-brown fine-grained sandstone; upper part grades northward into "Dog Creek Shale", "Blaine Formation", "Flowerpot Shale", and upper part of "Cedar Hills Sandstone"; lower part grades into "Duncan Sandstone". Thickness, about 100 feet near Chickasha and 300 feet near Okarche. (El Reno Group) ARDMORE-SHERMAN- Mudstone conglomerate, siltstone, and sandstone, red-brown; thickness, 100 to 200 feet, decreasing southeastward. (El Reno Group)
Crystal Mountain Sandstone (Phanerozoic | Paleozoic | Ordovician-Early): McALESTER TEXARKANA- Sandstone, pink to light-gray to dark-gray, fine- to coarse-grained, quartzose, with well-rounded, frosted grains, quartzitic, fractured in many places, with many quartz and orthoclase veins; 14-foot chert- and limestone-pebble conglomerate occurs at base; thickness, 500 feet or more, with maximum thickness in Arkansas 850 feet (called Lower Cool Creek in Arbuckle Mountains and Roubidoux Sandstone in Ozarks). Occurs in POTATO HILLS, BROKEN BOW UPLIFT or ADJACENT SMALLER UPLIFTS IN SOUTHEASTERN PART OF OUACHITA MOUNTAINS
Deese Group (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Middle): ARDMORE-SHERMAN- Member of Glenn Fm, mainly massive sandstone, conglomerate and shale. Base of "Confederate Limestone" down to top of "Otterville Limestone;" thickness, 9,700 feet. Occurs in the ARDMORE BASIN
Duncan Sandstone (Phanerozoic | Paleozoic | Permian ): CLINTON- "Duncan Sandstone," Pd, light-gray and reddish-brown, cross-bedded, fine-grained sandstone and mudstone conglomerate with some interbedded yellowish-gray and reddish-brown shales; thickness, about 200 feet; gradational into the Cedar Hills Sandstone northward and into the Flowerpot Shale northward and westward. OKLAHOMA CITY- Mainly red-brown to orange-brown fine-grained sandstone, with some mudstone conglomerate and shale; grades northward into "Cedar Hills Sandstone" and "Chickasha Formation". Thickness, 450 feet near Chickasha, 300 feet near Oklahoma City, and 100 feet or more near Okarche. (El Reno Group) ARDMORE-SHERMAN- Sandstone, white to buff, fine- to coarse-grained, moderately indurated, with interbedded mudstone conglomerates and siltstones; thickness, 100 to 400 feet, decreasing southeastward. (El Reno Group)
Garber Sandstone (Phanerozoic | Paleozoic | Permian ): ENID- Mostly orange-brown, fine- to medium-grained quartzose sandstone and conglomerate, grading northward into shale and calcitic siltstone. Thickness, about 600 feet (180 m). (Sumner Group) OKLAHOMA CITY- Mostly orange-brown to red-brown fine-grained sandstone, irregularly bedded with red-brown shale and some chert and mudstone conglomerate. Thickness ranges from 150 feet in south to 400 feet or more in north. (Sumner Group) LAWTON- "Garber Sandstone," Pg, reddish-brown, fine-grained sandstone and mudstone conglomerate, 160 to 210 feet (49 to 64 m) thick, containing a basal sandstone, the "Asphaltum Sandstone Bed," about 10 to 60 feet (3 to 18 m) thick.(Sumner Group) ARDMORE-SHERMAN- Sandstone, red-brown, fine- to coarse-grained; thickness, about 110 to 150 feet, including Fairmont Shale west of Elmore City, Garvin County
Holly Creek Formation (Phanerozoic | Mesozoic | Cretaceous-Early ): McALESTER TEXARKANA- Gravel, composed mostly of quartz and novaculite, with clay and silt, tan to red-brown; unconformable on Ouachita rocks; thickness, 30 to 100 feet, thickening to 1,070 feet in subsurface of southern McCurtain County
Johns Valley Formation or Johns Valley Shale (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Early): ARDMORE-SHERMAN- "Johns Valley Formation"- Shale, dark-gray, with boulder conglomerate; thickness, 425 to 900 feet. Occurs in the OUACHITA MNTS McALESTER TEXARKANA- "Johns Valley Shale"- Shale, dark-gray, with some stringers of Wapanucka-like limestone in northwestern part of area; contains exotic boulders of southern Arbuckle Mountain facies, ranging from Fort Sill to Goddard and as large as 369 feet in diameter; some Wapanucka nodules are not exotic but were formed in place; thickness, 300 to 1,000 feet. Occurs in the OUACHITA MTNS SOUTH OF TI VALLEY FAULT.
Pine Top Chert (Phanerozoic | Paleozoic | Devonian-Early): McALESTER TEXARKANA- Limestone, chert, and cherty limestone, gray to light-gray to tan to white and pink; contains Haragan brachiopods; at top is an 8-foot chert conglomerate; base not exposed; thickness, 60 feet. Occurs in the OUACHITA MTNS NORTH OF TI VALLEY FAULT
Post Oak Conglomerate (Phanerozoic | Paleozoic | Permian ): LAWTON- "Post Oak Conglomerate," Ppo, limestone conglomerate near limestone outcrops; contains zeolite-opal ("Tepee Creek Formation") locally, near gabbro and anorthosite outcrops; arkosic gravel and cobbles near igneous outcrops. These rock types are interbedded with sand, silt, clay, and shale, as much as 500 feet (150 m) thick at surface but several thousand feet thick in subsurface, extending down section into Pennsylvanian rocks.
Purcell Sandstone (Phanerozoic | Paleozoic | Permian ): OKLAHOMA CITY- Red-brown to maroon fine- to coarse-grained sandstone, mudstone conglomerate, and red- brown shale. Thickness, 150 feet. (Hennessey Group) ARDMORE-SHERMAN- Sandstone, red-brown to maroon and greenish-gray, fine- to coarse-grained, with some shale and mudstone conglomerate; thickness, 90 to 150 feet, decreasing southward. (Hennessey Group).
Purgatoire Formation (Phanerozoic | Mesozoic | Cretaceous-Early ): CIMARRON- Kiowa Shale Member: Gray to black fossiliferous shale with sandstone in the upper part. Thickness ranges from 0 to 50 +/- feet. Cheyenne Sandstone Member: Massive, white to buff, fine- to medium-grained sandstone, containing some conglomerate in the lower part, from 0 to 120 +/- feet thick.
San Angelo Sandstone (Phanerozoic | Paleozoic | Permian ): LAWTON- "San Angelo Sandstone," Psa, interstratified sandstone, mudstone conglomerate, and shale, as much as 80 feet (24 m) thick.
Thurman Sandstone (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Middle): OKLAHOMA CITY- Mainly medium-grained, silty sandstone with cherty conglomerate at base. Only a few feet exposed in quadrangle. FORT SMITH- Sandstone and shale. ARDMORE-SHERMAN- Sandstone, brown, fine- to coarse-grained, with some gray shale and basal 50-foot chert conglomerate; thickness, 80 to 250 feet, decreasing southwestward. McALESTER TEXARKANA- Sandstone, brown, fine- to coarse-grained, with some gray shale and a basal 50-foot chert conglomerate; grades northward into Boggy Formation; top eroded at many places; thickness, 200 feet.

Oregon

Clastic sedimentary rocks (Upper and Lower Cretaceous) (Early to Late Cretaceous): Locally fossiliferous sandstone and conglomerate; marine fossils indicate Early Cretaceous (Albian) age (Jones, 1960). Includes the Hornbrook Formation of Peck and others (1956), the Grove Creek strata of Jones (1960) and Page and others (1977), Hunters Cove Formation, Cape Sebastian Sandstone, Humbug Mountain Conglomerate, and Rocky Point Formation (Dott, 1971; Blake and others, 1985) and clastic sedimentary rocks on the West Fork of the Illinois River near Waldo (Imlay and others, 1959), about 12 km south of Cave Junction
Marine sedimentary rocks (lower Miocene and Oligocene) (Oligocene to Early Miocene): Fossiliferous marine tuffaceous arkosic sandstone, and lesser conglomerate, sandstone, claystone, nonmarine volcanic sedimentary rocks, and minor coal. Molluscan and vertebrate (Cetacea) fossils indicate late Oligocene and Miocene age (Orr and Miller, 1983; Miller and Orr, 1984b). Includes Butte Creek beds of Harper (1946), and several Miocene and late Oligocene units of Miller and Orr (1984a, b)
Nonmarine sedimentary rocks (Eocene) (Eocene): Continentally derived conglomerate, pebble conglomerate, sandstone, siltstone, and mudstone containing abundant biotite and muscovite. Dominantly nonvolcanic; clastic material derived from underlying older rocks
Sedimentary and volcanic rocks (Jurassic and Upper Triassic?) (Late Triassic? to Jurassic): Olive-drab, pale-brown, dark-gray, and black volcanic graywacke and siltstone; lesser conglomerate and slate, and minor limestone and chert. Includes more extensive outcrops of Triassic or Jurassic limestone at north base of Juniper Mountain in northern Malheur County and near Huntington in southeastern Baker County. Interlayers of silicic and intermediate volcanic rocks are rare. Locally metamorphosed to prehnite-pumpellyite and zeolite facies and in places to greenschist facies. Folded, sheared, and locally foliated. Includes the Weatherby Formation of Brooks (1979). Age is Late Triassic(?) and Early and Middle Jurassic (Sinemurian-Callovian)
Sedimentary rocks (Cretaceous) (Cretaceous): Marine graywacke, subgraywacke, conglomerate, and shale. Pebbles and cobbles in conglomerate are well rounded volcanic and metavolcanic rocks, low-grade metasedimentary rocks, quartzite, chert, and minor silicic and intermediate plutonic rocks. Shales are gray to black and are fissile to blocky. Sandstones commonly display graded bedding; conglomerate beds are commonly thick and poorly bedded. Shales, near Mitchell, have yielded latest (Early Cretaceous (Albian) fossils; some earliest Late Cretaceous (Cenomanian) fossils occur in beds southeast of Mitchell (D.L. Jones, oral Commun., 1972). Includes Hudspeth and Gable Creek Formations (OR049), Bernard Formation (OR028), and Cretaceous sedimentary rocks (OR008)
Sedimentary rocks (Pleistocene and Pliocene) (Pliocene to Pleistocene): Semiconsolidated lacustrine and fluvial ashy and palagonitic sedimentary rocks, mostly tuffaceous sandstone and siltstone; locally contains abundant palagonitized basaltic debris and some pebble conglomerate. Includes alluvial gravel and mudflow deposits of Walters Hill and Springwater Formations (Trimble, 1963). In places, grades laterally through palagonite tuff and breccia into basalt flows
Yaquina Formation (lower Miocene and upper Oligocene) (Late Oligocene to Early Miocene): Thick- to thin-bedded sandstone, conglomerate, and tuffaceous siltstone of deltaic origin; locally contains thin coal and ash beds. Conglomerate contains abundant clasts of pumice and dacitic volcanic rocks. In places includes thick lenses of marine tuffaceous siltstone and fine-grained sandstone. Foraminifers in formation assigned to the Zemorrian and lower part of the Saucesian Stages of Kleinpell (1938) and molluscan fauna to the lower Blakeley Stage of Weaver and others (1944)

Pennsylvania

Burgoon Sandstone (Mississippian): Burgoon Sandstone - Buff, medium-grained, crossbedded sandstone; includes shale and coal; in places, contains conglomerate at base; contains plant fossils; equivalent to Pocono Formation of Ridge and Valley province.
Clarks Ferry Member of Catskill Formation (Devonian): Clarks Ferry Member of Catskill Formation - Gray to yellowish-gray sandstone, siltstone, and conglomerate.
Clarks Ferry Member of Catskill Formation (Devonian): Clarks Ferry Member of Catskill Formation - Gray to yellowish-gray sandstone and conglomerate.
Epler Formation (Ordovician): Epler Formation - Thick-bedded, medium- to medium-dark-gray, finely crystalline limestone, weathering light gray; yellow dolomitic laminae; interbedded medium-dark-gray, finely crystalline dolomite, weathering yellowish gray; edgewise conglomerate; fossil-fragment and oolitic lenses.
Gettysburg conglomerate (Triassic): Gettysburg conglomerate - Gray quartz conglomerate, sandstone, and red siltstone and mudstone.
Hammer Creek conglomerate (Triassic): Hammer Creek conglomerate - Cobble and pebble quartz conglomerate interbedded with red sandstone.
Hardyston Formation (Cambrian): Hardyston Formation - Typically light-gray, fine- to medium-grained quartzite, and feldspathic sandstone; color ranges from nearly white to dark gray; massive bedded; Scolithus present in upper part; quartz-pebble conglomerate occurs at base.
Limestone fanglomerate (Triassic): Limestone fanglomerate - Yellowish-gray to medium-gray, angular limestone and dolomite pebbles, cobbles, and fragments set in a red, very fine grained quartz matrix; a few shale-clast interbeds.
Marburg Schist (Probably lower Paleozoic): Marburg Schist - Gray-green phyllite, mica-chlorite schist, and conglomerate.
New Oxford conglomerate (Triassic): New Oxford conglomerate - Quartz or quartzite pebbles, cobbles, and rare boulders set in a red, sandy, ferruginous matrix; some silica cement; some feldspar clasts.
Packerton Member of Catskill Formation (Devonian): Packerton Member of Catskill Formation - Greenish-gray to gray sandstone and some siltstone; some laterally persistent conglomerate beds in lower part.
Peach Bottom Slate and Cardiff Conglomerate, undivided (Probably lower Paleozoic): Peach Bottom Slate and Cardiff Conglomerate, undivided - Bluish-black slate (Peach Bottom); quartz conglomerate having a matrix of sericite and chlorite (Cardiff).
Pocono Formation (Mississippian): Pocono Formation - Light-gray to buff or light-olive-gray, medium-grained, crossbedded sandstone and minor siltstone; commonly conglomeratic at base and in middle; medial conglomerate, where present, is used to divide into Mount Carbon and Beckville Members; equivalent to Burgoon Sandstone of Allegheny Plateau.
Pocono and Rockwell Formations, undivided (Mississippian and Devonian): Pocono and Rockwell Formations, undivided: Buff, medium-grained, crossbedded sandstone and some conglomerate (Pocono), overlying buff to olive-gray, fine- to medium-grained, crossbedded sandstone containing a few beds of shale and conglomerate (Rockwell); shown in southwestern Bedford County only.
Poplar Gap Member of Catskill Formation (Devonian): Poplar Gap Member of Catskill Formation - Gray and light-olive-gray sandstone, conglomerate, and siltstone containing intermittent red beds; laterally equivalent to Clarks Ferry, Sawmill Run, and Berry Run Members.
Poplar Gap and Packerton Members of Catskill Formation, undivided (Devonian): Poplar Gap and Packerton Members of Catskill Formation, undivided - Includes, in descending order, the Poplar Gap (Dcpg) and Packerton (Dcp) Members of the Catskill Formation.
Pottsville Formation (Pennsylvanian): Pottsville Formation - Predominantly gray sandstone and conglomerate; also contains thin beds of shale, claystone, limestone, and coal; includes Olean and Sharon conglomerates of northwestern Pennsylvania; thin marine limestones present in Beaver, Lawrence, and Mercer Counties; minable coals and commercially valuable high-alumina clays present locally.
Quartz fanglomerate (Triassic): Quartz fanglomerate - Well-rounded quartzite pebbles, cobbles, and rare boulders set in a reddish-brown, sandy matrix.
Rockwell Formation (Mississippian and Devonian): Rockwell Formation - Buff, fine- to medium-grained, crossbedded, argillaceous sandstone and dark-gray shale; includes some carbonaceous shale, sporadic conglomerate beds, and diamictite; included in lower "Pocono" of earlier workers.
Shawangunk Formation (Silurian): Shawangunk Formation - Light- to dark-gray, fine- to very coarse grained sandstone and conglomerate containing thin shale interbeds. Includes four members, in descending order: Tammany--conglomerate and sandstone; Lizard Creek--sandstone and red or green shale; Minsi--sandstone and conglomerate; Weiders--conglomerate. Tammany and Lizard Creek Members together are approximately equivalent to Clinton Group to the west; Minsi and Weiders Members together are equivalent to Tuscarora Formation to the west.
Stockton conglomerate (Triassic): Stockton conglomerate - Quartz cobbles set in a poorly sorted, sandy matrix; includes conglomeratic sandstone.
Stonehenge Formation (Ordovician): Stonehenge Formation - Medium-light-gray to medium-gray, finely crystalline, thick-bedded limestone, containing dark siliceous laminae, edgewise conglomerate beds, and fossil-fragment lenses; dolomite beds increase in number eastward.
Stonehenge Formation (Ordovician): Stonehenge Formation - Gray, finely crystalline limestone containing dark-gray silty laminations; numerous edgewise conglomerate beds.
Stonehenge/Larke Formation (Ordovician): Stonehenge/Larke Formation - Medium-gray, medium-bedded to laminated, fossiliferous, oolitic limestone containing edgewise conglomerate; to the west, Stonehenge is laterally equivalent to medium- to dark-gray, coarsely crystalline dolomite (Larke).
Waynesboro Formation (Cambrian): Waynesboro Formation - Greenish-gray and grayish-purple shale interbedded with greenish-gray sandstone and conglomerate; occurs in Henrietta fault block only.

Rhode Island

Narragansett Bay Group - Dighton Conglomerate (Pennsylvanian): Narragansett Bay Group - Dighton Conglomerate - Gray conglomerate consisting predominantly of quartz clasts set in a sand-sized matrix. Minor lenses of litharenite and arkosic sandstone.
Narragansett Bay Group - Pondville Conglomerate (Pennsylvanian): Narragansett Bay Group - Pondville Conglomerate - Gray to greenish conglomerate with sand-sized matrix, interbedded with quartz arenite and litharenite; typically lenticular and discontinuous. At type locality (Pondville Station, Massachusetts), unit consists of interbedded red and green slate, siltstone, arkose, and quartzite-pebble conglomerate.
Narragansett Bay Group - Purgatory Conglomerate (Pennsylvanian): Narragansett Bay Group - Purgatory Conglomerate - Buff to pale-gray conglomerate. Clasts consist entirely of quartzite; matrix primarily quartz, plus sparse amounts of magnetite. Cobbles and boulders are ubiquitously elongate, due to pressure-solution phenomena associated with deformation.
Narragansett Bay Group - Sachuest Arkose (Pennsylvanian): Narragansett Bay Group - Sachuest Arkose - Gray, smoky-quartz granule-conglomerate, sandstone, and pebble to cobble conglomerate, interbedded with black carbonaceous phyllite. Includes some rock mapped formerly as Pondville Conglomerate.
Narragansett Bay Group - Wamsutta Formation (Pennsylvanian): Narragansett Bay Group - Wamsutta Formation - Red sandstone, shale, and conglomerate, locally containing abundant volcanic detritus as clasts and matrix. Plant fossil localities occur in adjacent Massachusetts. Minor, but significant amounts of interstratified bimodal-composition volcanic lava flows consisting of alkalic basalt (locally pillowed) and rhyolite are present in adjacent Massachusetts.
Newport Group - Newport Neck Formation (Late Proterozoic? or older?): Newport Group - Newport Neck Formation - Sequences of gray, green, and maroon graded rocks, ranging from fine-grained feldspathic granule-conglomerate to maroon slate.

South Carolina

Chatham Group, undivided (Triassic): Chatham Group, undivided: conglomerate, sandstone and mudstone
Duplin Formation (Pliocene): Duplin Formation: Coastal terrace of Carolinas. Pliocene equivalent to Yorktown. Deeply weathered.

South Dakota

Pahasapa Limestone, Englewood Formation, Whitewood Limestone, Winnipeg Formation, and Deadwood Formation (Phanerozoic | Paleozoic | Cambrian Ordovician(?) Silurian(?) Devonian(?) Carboniferous Mississippian): Note: see individual descriptions
Sioux Quartzite (Proterozoic | Paleoproterozoic): Pink, reddish to tan, siliceous, fine to coarse-grained, iron-stained orthoquartzite with minor conglomerate and mudstone layers. Estimated thickness greater than 1,000 ft (305 m).
Whitewood Limestone, Winnipeg Formation, and Deadwood Formation (Phanerozoic | Paleozoic | Cambrian Ordovician): Whitewood Limestone (Ordovician)- Mottled, tan, gray to lavender, fine- to medium-crystalline, sparsely fossiliferous limestone and dolomite. Thickness up to 70 ft (21 m). Winnipeg Formation (Ordovician)- Grat and light-green, fissile shale, and tan, calcareous siltstone, sandy shale, and limestone lenses. Thickness up to 110 ft (34 m). Deadwood Formation (Ordovician to Cambrian)- Variegated, yellow to red, brown, gray, and green, glauconitic, conglomerate, sandstone, shale, dolomitic limestone, and dolomite. Thickness 4-400 ft (1-122 m).

Tennessee

Chilhowee Group; Cochran Conglomerate (Cambrian): Chilhowee Gourp; Cochran Conglomerate - Quartz-pebble conglomerate, gray pebbly arkose, siltstone and shale; irregular bedding, scour features, crossbedding common; maroon micaceous arkose and shale near middle and base. Thickness about 1,200 feet.
Cochran Conglomerate (Cambrian): Cochran Conglomerate - Quartz-pebble conglomerate, gray pebbly arkose, siltstone and shale; irregular bedding, scour features, crossbedding common; maroon micaceous arkose and shale near middle and base. Thickness about 1,200 feet.
Crab Orchard Mounatins and Gizzard Group (Pennsylvanian): Crab Orchard Mountains and Gizzard Groups - Sandstone, conglomerate, siltstone, shale, and thin coal beds. From top down Crab Orchard Mountains group includes Rockcastle Conglomerate, Vadever Formation, Newton Sandstone, Whitwell Shale, and Sewanee Conglomerate; Gizzard Group includes Signal Point Shale, Warren Point Sandstone, and Raccoon Mountain Formation. Thickness about 1,200 to 1,400 feet.
Crab Orchard Mountains Group (Pennsylvanian): Crab Orchard Mountains Group - Only the lowest formation of the group, the Sewanee Conglomerate, is preserved in the area of this sheet. Sewanee is gray to brown, medium- to coarse-grained conglomeratic sandstone, with a thin zone of ferruginous quartz- and shale-pebble conglomerate at base. Maximum preserved thickness 35 feet.
Crab Orchard Mountains Group, including Rockcastle Conglomerate, Vandever Formation, Newton Sandstone, Whitwell Shale, and Sewanee Conglomerate (Pennsylvanian): Crab Orchard Mountains Group - Conglomerate, sandstone, siltstone, shale, and coal; from top of Rockcastle Conglomerate to base of Sewanee Conglomerate. Thickness 200 to 950 feet; including Rockcastle Conglomerate - Conglomeratic sandstone and sandstone, gray to brown, fine- to coarse-grained. Thin coal-bearing shale locally present near middle. Thickness 150 to 220 feet; Vandever Formation - Mostly shale and siltstone, dark-gray to light-brown; conglomerate or sandstone in middle to south. Lantana and Morgan Springs coals near base and top. Thickness as much as 450 feet, average about 300 feet; Newton Sandstone - Sandstone, gray to brown or pink, fine- to medium-grained, locally conglomeratic. Thickness as much as 200 feet; average about 90 feet; Whitwell Shale - Mostly dark-gray to light-brown shale, with minor siltstone; locally middle part is sandstone. Richland coal near base; Sewanee coal in upper part. Thickness as much as 220 feet, average about 75 feet; Sewanee Conglomerate - Conglomeratic sandstone and sandstone, gray to brown, fine- to coarse-grained. Thickness as much as 200 feet, average about 100 feet.
Crab Orchard Mountains and Gizzard Groups (Pennsylvanian): Crab Orchard Mountains and Gizzard Groups - Sandstone, conglomerate, siltstone, shale, and thin coal beds. Thickness 1,200 to 1,400 feet.
Lenoir Limestone (Ordovician): Lenoir Limestone - Nodular, argillaceous, gray limestone; in places basal sedimentary breccia, conglomerate, quartz sand; Mosheim Limestone Member (dense, light- to medium-gray limestone) near base. Thickness 25 to 500 feet.
Lenoir Limestone (Ordovician): Lenoir Limestone - Nodular, argillaceous, gray limestone; in places basal sedimentary breccia, conglomerate, quartz sand; Mosheim Limestone Member (dense, light- to medium-gray limestone) near base. Thickness 25 to 500 feet.
Maryville Limestone (Cambrian): Maryville Limestone - Gray, ribboned (silt and dolomite), fine-grained, evenly bedded limestone; intraformational conglomerate and oolitic layers common; clay shale and light-gray dolomite locally. Thickness 300 to 800 feet.
Rich Butt Sandstone (Precambrian): Rich Butt Sandstone - Gray, massive beds of feldspathic, fine- to medium-grained sandstone, with interbeds of dark slate and arkosic conglomerate; exact stratigraphic position unknown. Thickness about 1,500 feet.
Rockcastle Conglomerate (Pennsylvanian): Rockcastle Conglomerate - Conglomeratic sandstone and sandstone, gray to brown, fine- to coarse-grained. Thin coal-bearing shale locally present near middle. Thickness 150 to 220 feet.
Sandsuck Formation (Precambrian): Sandsuck Formation - Olive-green and gray, argillaceous, micaceous shale with coarse feldspathic sandstone and quartz- pebble conglomerate. Thickness about 2,000 feet.
Walden Creek Group; Sandsuck Formation (Precambrian): Wladen Creek Group; Sandsuck Formation - Olive-green and gray, argillaceous, micaceous shale with coarse feldspathic sandstone and quartz- pebble conglomerate. Thickness about 2,000 feet.

Texas

Allamore Formation (preCambrian-Proterozoic [Grenville]): Allamore Formation
Bissett Conglomerate (Phanerozoic | Mesozoic | Cretaceous-Early): Bissett Conglomerate
Brazos River Formation (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian [Des Moines]): Brazos River Formation
Delaho Formation and unit 9 of Rawls Formation (Phanerozoic | Cenozoic | Tertiary | Miocene): Delaho Formation and unit 9 of Rawls Formation NOTE: This unit is represented within the map unit explanation of (Geol. Map of Texas, 1992, Bur. Econ. Geol.) but does not occur on the map and is NOT included in the spatial data.
Delaho and Rawls Formations, undivided (Phanerozoic | Cenozoic | Tertiary | Oligocene Miocene): Delaho and Rawls Formations, undivided NOTE: This unit is represented within the map unit explanation of (Geol. Map of Texas, 1992, Bur. Econ. Geol.) but does not occur on the map and is NOT included in the spatial data.
Dockum Group, undivided (Phanerozoic | Mesozoic | Triassic-Late): Dockum Group
Etholen Conglomerate (Phanerozoic | Mesozoic | Cretaceous-Early): Etholen Conglomerate
Gaptank Formation (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Early Pennsylvanian-Middle Pennsylvanian-Late): Gaptank Formation
Gatuna Formation (Phanerozoic | Cenozoic | Quaternary | Pleistocene-Middle(?)): Gatuna Formation
Hazel Formation (preCambrian-Proterozoic [Grenville]): Hazel Formation
Hickory Sandstone Member (Phanerozoic | Paleozoic | Cambrian-Middle): Hickory Sandstone Member
Lenox Hills and Neal Ranch Formations, undivided (Phanerozoic | Paleozoic | Permian [Wolfcamp]): Lenox Hills and Neal Ranch Formations, undivided
Nocona Formation (Phanerozoic | Paleozoic | Permian [Wolfcamp Leonard]): Nocona Formation
Perdiz Conglomerate, Tascotal Formation, and tuffaceous sediments of Fresno Formation (Phanerozoic | Cenozoic | Tertiary | Oligocene): Perdiz Conglomerate, Tascotal Formation, and tuffaceous sediments of Fresno Formation
Presidio Formation (Phanerozoic | Mesozoic | Cretaceous-Early [Aptian Albian]): Presidio Formation
Quaternary-Tertiary deposits, undivided (Phanerozoic | Cenozoic | Tertiary Quaternary | Pliocene Pleistocene): Quaternary-Tertiary deposits, undivided
Travis Peak Formation (Phanerozoic | Mesozoic | Cretaceous-Early): Travis Peak Formation
Twin Mountains Formation (Phanerozoic | Mesozoic | Cretaceous-Early): Twin Mountains Formation
Van Horn Sandstone (preCambrian-Proterozoic [Grenville]): Van Horn Sandstone
Woods Hollow Shale, Fort Pena Formation, Alsate Shale, Marathon Limestone, and Dagger Flat Sandstone, undivided (Phanerozoic | Paleozoic| Cambrian Ordovician): Woods Hollow Shale, Fort Pena Formation, Alsate Shale, Marathon Limestone, and Dagger Flat Sandstone, undivided
Yearwood Formation (Phanerozoic | Mesozoic | Cretaceous-Early): Yearwood Formation
Yucca Formation (Phanerozoic | Mesozoic | Cretaceous-Early): Yucca Formation

Utah

Cambrian quartzite in Logan-Huntsville Allochthon (Early to Middle Cambrian)
Cambrian quartzite in Salt Lake City-Coalville-Randolph region (Early to Middle Cambrian)
Cambrian quartzite in Uinta Mountains-Uinta Basin area (Early to Middle Cambrian)
Cambrian quartzite in central Utah (Early to Middle Cambrian)
Cambrian quartzite in western Utah (Early Cambrian)
Cretaceous (2) sedimentary rocks in Salt Lake City-Coalville-Randolph region (Late Cretaceous)
Cretaceous (2) sedimentary rocks in western Utah (Late Cretaceous)
Cretaceous (3) sedimentary rocks in Salt Lake City-Coalville-Randolph region (Late Cretaceous)
Cretaceous (3) sedimentary rocks in central Utah (Late Cretaceous)
Cretaceous (3) sedimentary rocks in western Utah (Late Cretaceous)
Cretaceous and Tertiary sedimentary rocks in Uinta Mountains-Uinta Basin region (Late Cretaceous to Paleocene)
Cretaceous and Tertiary sedimentary rocks in southeastern Utah (Late Cretaceous to Paleocene)
Jurassic (2) sedimentary rocks in central Utah (Late Jurassic)
Jurassic (2) sedimentary rocks in southeastern Utah (Late Jurassic)
Tertiary (1) sedimentary rocks in Logan-Huntsville Allochthon (Late Cretaceous to Early Eocene)
Tertiary (1) sedimentary rocks in Salt Lake City-Coalville-Randolph region (Late Paleocene to Early Eocene)
Tertiary (2) sedimentary rocks in Salt Lake City-Coalville-Randolph region (Eocene)
Tertiary (4) sedimentary rocks in Uinta Mountains-Uinta Basin region (Oligocene)
Tertiary (4) sedimentary rocks in northwestern Utah (Middle Miocene to Late Pliocene)
Tertiary (4) sedimentary rocks in southwestern Utah (Miocene)
Tertiary (5) sedimentary rocks in Uinta Mountains-Uinta Basin region (Miocene)
Tertiary (5) sedimentary rocks in southeastern Utah (Pliocene)
Tertiary (5) sedimentary rocks in southwestern Utah (Miocene to Pliocene)
Triassic (2) sedimentary rocks in Logan-Huntsville Allochthon (Middle to Late Triassic)
Triassic (2) sedimentary rocks in Salt Lake City-Coalville-Randolph region (Middle to Late Triassic)
Triassic (2) sedimentary rocks in southwestern Utah (Late Triassic)
Younger Precambrian metamorphic rocks in central Utah (Proterozoic Z)
Younger Precambrian metamorphic rocks in western Utah (Precambrian)

Virginia

Buffards Formation (Ordovician): Buffards Formation - Micaceous conglomerate, schist, and phyllite.
Chemung Formation (redefined as Foreknobs Formation) (Devonian): Chemung Formation - Shale and sandstone with a few thin, quartz-pebble conglomerates and red-beds.
Chilhowee Group (Cambrian): Chilhowee Group - Appalachian Plateaus and Valley and Ridge: Quartzite, conglomerate, feldspathic sandstone, phyllite, and minor ferruginous sandstone and volcanic rocks. Blue Ridge Anticlinorium: Conglomerate, quartzite, metasiltstone, and phyllite.
Fauquier Formation - Metaconglomerate (Proterozoic Z): Fauquier Formation - Pebble or cobble conglomerate.
Knobs Formation, Paperville Shale, Lenoir and Mosheim Limestone (Ordovician): Knobs Formation, Paperville Shale, Lenoir and Mosheim Limestone - Sandstone, conglomerate, siltstone; black, fissile shale; and limestone, in part cherty.
Lynchburg Group - Conglomerate and metagraywacke (Proterozoic Z): Lynchburg Group - Conglomerate and metagraywacke.
Lynchburg Group - Fanglomerate (Proterozoic Z): Lynchburg Group - Fanglomerate
Lynchburg Group; Metagraywacke (Proterozoic Z): Lynchburg Group - Metagraywacke
Massanutten Sandstone (Silurian): Massanutten Sandstone - Quartzarenite with lenses of conglomerate.
Mount Rogers Formation - Conglomerate, graywacke, laminated siltstone, and shale. (Proterozoic Z): Mount Rogers Formation - Conglomerate, graywacke, laminated siltstone, and shale.
Newark Supergroup; Conglomerate, arkosic maatrix (Upper Triassic): Conglomerate, arkosic matrix
Newark Supergroup; Conglomerate, carbonate clasts (Upper Triassic): Conglomerate, carbonate clasts
Newark Supergroup; Conglomerate, greenstone clasts (Upper Triassic): Conglomerate, greenstone clasts
Newark Supergroup; Conglomerate, mixed clasts (Upper Triassic): Conglomerate, mixed clasts
Newark Supergroup; Jurassic Conglomerate (Lower Jurassic): Conglomerate

Vermont

Bridgeman Hill Formation (Cambrian): Bridgeman Hill Formation - Undifferentiated dolomite, slate, and conglomerate, on east limb of St. Albans synclinorium, about equivalent to Dunham, Parker, Rugg Brook, and Saxe Brook Formations.
Cheshire Quartzite (Cambrian): Cheshire Quartzite - Very massive, white to faintly pink or buff vitreous quartzite near the top in west-central and southwestern VT; predominantly a less massive appearing mottled gray, somewhat phyllitic quartzite; dolomitic sandstone and conglomerate near the base of the formation in west-central VT apparently grades southward into the Dalton Formation. Mapping in Bristol Notch and along the Green Mountain front indicate that the Cheshire Quartzite appears to be at least 2500 ft thick, which is about 2.5 times the original estimated thickness to the north and south. Near the base, the Cheshire is a massive argillaceous feldspathic meta-sandstone, containing recrystallized quartz and K-feldspar in a muscovite and biotite matrix. These lithologies grade upward through medium to thick-bedded schistose feldspathic meta-sandstones to clean, massive 'quartzites' of the Green Mountain front. Rocks currently mapped as the eastern-most Cheshire Quartzite probably belong to the Pinnacle Formation and are in fault contact with the Cheshire (Condon, 1993).
Clough Formation (Silurian): Clough Formation - Boulders, cobbles, pebbles and angular fragments of quartzite, micaceous quartzite, and gray mica schist in matrix of dark gray quartz-mica schist or quartzite; schist commonly contains porphyroblasts of biotite, less commonly garnet. (Northeastern Vermont).
Clough Formation (Silurian): Clough Formation - Quartzite, quartz-conglomerate, and mica schist; lenses of fossiliferous calcareous quartzite in upper part. (Southeastern Vermont).
Dalton Formation (Cambrian): Dalton Formation - Schistose quartzite containing pebbles of feldspar and blue quartz; impure dolomite containing pebbles of quartz and feldspar occurs locally; conglomerate common near base. Occurs in southwestern Vertmont.
Highgate Formation (Ordovician): Highgate Formation - Banded blue limestone and calcareous slate; local lenses of limestone conglomerate; on west limb of St. Albans synclinorium.
Missisquoi Formation, Umbrella Hill Member (Ordovician): Missisquoi Formation, Umbrella Hill Member - Quartz and slate pebble phyllitic conglomerate with interbeds of slate and phyllite - chiefly quartz-sericite-magnetite-chloritoid rocks.
Pinnacle Formation (Cambrian): Pinnacle Formation - Schistose graywacke, gray to buff, commonly striped, quartz-albite-sericite-biotite-chlorite rock predominates; quartz-cobble and boulder conglomerate is common, chiefly near base. (Northern and Central Vermont).
Rugg Brook Formation (Cambrian): Rugg Brook Formation - Sandy gray dolomite, dolomite conglomerate, and interbeds of gray-weathered sandstone, in St. Albans and Middlebury synclinoria.
Shaw Mountain Formation (Silurian): Shaw Mountain Formation - Quartzite, quartz conglomerate, cummingtonite schist, amphibolite, and quartz-sericite schist with porphyroblasts of biotite and garnet.
Sweetsburg Formation, Rockledge Conglomerate Member (Cambrian): Sweetsburg Formation, Rockledge Conglomerate Member - Phenoclasts chiefly of biohermal limestone in a matrix of gray limestone containing frosted quartz sand grains.
Tyson Formation (Cambrian): Tyson Formation - Feldspathic quartz-mica schist containing biotite, chlorite, and carbonate; many beds contain pebbles of quartz and feldspar; cobble or boulder conglomerate commonly at base; thin beds of quartzite, carbonaceous phyllite, and schistose dolomite in upper part, overlain at top by massive buff dolomite as much as 30 ft thick. (Southern and Central Vermont). The Tyson Formation contains grits and conglomerates at its base that unconformably overlie basement. The conglomerates and grits are as much as 150 m thick and contain lenses of dolomitic quartzite and feldspathic grit. Unit also contains black carbonaceous phyllite and interbedded dolostone as much as 100 m thick, followed by beige to tan weathering beds of dolostone that increase in abundance toward the top of the unit and pass into punky weathering dolomitic and feldspathic quartzite at the top. From a point near the southwest corner of the Andover quad, the rocks of the Tyson Formation are laterally replaced by albitic schists and granofels of the Hoosac Formation to the south. Therefore, Tyson laterally replaces the Hoosac from south to north along the eastern margin of the Green Mountain massif. The Tyson Formation is of Late Proterozoic(?) and Early Cambrian age (Ratcliffe, 1994).

Washington

Cretaceous sedimentary rocks, mostly marine (Late Cretaceous; possibly Eocene): Cretaceous conglomerate, sandstone, shale, breccia, limestone, and gritstone in San Juan Islands.
Miocene-Pliocene nonmarine rocks (Miocene-Pliocene): Tuffaceous and pumiceous andesitic sandstone and siltstone with interbedded conglomerate and claystone. Conglomerate beds chiefly andesitic, but also quartzitic, granitic, and basaltic; includes basalt flows locally.
Oligocene nonmarine rocks (Oligocene): Andesite conglomerate, tuff beds, and mudflow material. Includes some interbedded andesite flows in Columbia River Gorge. Lake sediments with Oligocene flora in Republic area in Ferry County. Massive tuffaceous sandstone and siltstone with beds of coal and high-alumina clay in Castle Rock-Toledo coal district in Cowlitz and Lewis Counties; include local interbedded basalt flows and some marine and late Eocene rocks.
Pliocene marine rocks (Pliocene): Coarse conglomerate, shale, and minor sandstone; along ocean beaches in Grays Harbor County.
Pliocene nonmarine rocks (Pliocene): Conglomerate, sandstone, shale, and mudstone. Tuffaceous in part; contains alluvial fan type material locally.
Precambrian conglomerate (Late-Proterozoic): Gray-brown, coarse, poorly sorted pebbles and cobbles of limestone, dolomite, reddish-brown quartzite, black slate or phyllite, and rarely granitic rocks in a gray sandy phyllite matrix; northeastern Pend Oreille County and southwestern Stevens County. Rocks become finer grained and more schistose and the unit becomes thicker toward the southwest, where there is included an isolated subunit which may be a tillite, consisting of cobbles, boulders, and blocks of argillite and carbonate rocks in a fine silty matrix.
Quaternary nonmarine deposits (Pleistocene): Periglacial lacustrine deposits. Light-brown, well-sorted and bedded clayey sandstone and sandy clay with interbeds of volcanic ash and calcareous cemented gravels.
Silurian-Devonian rocks (Silurian-Devonian): Mainly black argillite; some limestone, thin beds of conglomerate, sandstone, quartzite, and dolomite. Rocks confined to northwestern Pend Oreille County and adjacent Stevens County. Silurian age based on Monograptus and corals of several unusual genera; Devonian age based on coral fauna.
Tertiary nonmarine rocks, undivided (Tertiary; mostly Eocene): Sandstone, shale, conglomerate, agglomerate, and tuff; includes some lava flows. Massive conglomerate, sandstone, siltstone, and ferruginous shale in northwestern Whatcom County.
Upper Triassic and/or Lower Jurassic Marine Rocks (Cretaceous-Triassic): Conglomerate, gritstone, graywacke, and carbonaceous argillite of northwestern Whatcom County.

Wisconsin

Copper Harbor Conglomerate (Middle Proterozoic): Copper Harbor Conglomerate - Red lithic conglomerate and sandstone; mafic to felsic volcanic flows similar to those of the unnamed formation (unit Yu) are interlayered with the sedimentary rocks.
Menominee Group; Blair Creek Formation (Early Proterozoic): Menominee Group; Blair Creek Formation - Dominantly dark-gray, massive, porphyritic tholeiitic basalt. Includes a basal conglomerate and a lean iron-formation in middle of formation
Oronto Group; Freda Sandstone; Conglomerate member (Middle Proterozoic): Oronto Group; Freda Sandstone; Conglomerate member
Quartzite (Early Proterozoic): Quartzite - Maroon but locally white, gray, and red quartzite (quartz arenite) with a basal quartzose conglomerate. At Flambeau Ridge (Chippewa County) consists of conglomerate. Distinguished from other quartzite units in being strongly deformed and metamorphosed. Includes Flambeau, Rib Mountain, McCaslin, and Thunder Mountain Quartzites of local usage
Rhyolite at and near Cary Mound and near Brokaw (about 1835 Ma) (Early Proterozoic): Rhyolite at and near Cary Mound and near Brokaw (about 1835 Ma) - Flow-banded rhyolite, welded tuff, volcanic conglomerate, and volcanogenic sedimentary rocks. Exposed in both Pembine-Wausau and Marshfield terranes.

West Virginia

Stonehenge Limestone (Ordovician): Stonehenge Limestone - gray, thin-bedded to massive, fossiliferous limestone, largely mechanically deposited, with small black chert nodules and beds of "edgewise" conglomerate. The highly resistant Stoufferstown Limestone member is found at the base.
Weverton-Loudoun Formation (Cambrian): Weverton-Loudoun Formation (Chilhowee Group) - tough quartzitic sandstones, conglomerates, and shale.

Wyoming

Absaroka Volcanic Supergroup: Thoroughfare Creek Group--Aycross Formation (Phanerozoic | Cenozoic | Tertiary | Eocene (44-49 Ma)): ABSAROKA VOLCANIC SUPERGROUP: THOROFARE CREEK GROUP (AGE 44 TO 49 Ma) Aycross Formation (age 49 Ma)--Brightly variegated bentonitic claystone and tuffaceous sandstone, grading laterally into greenish-gray sandstone and claystone. In and east of Jackson Hole contains gold-bearing lenticular quartzite conglomerate.
Bacon Ridge Sandstone (Phanerozoic | Mesozoic | Cretaceous-Late): BACON RIDGE SANDSTONE--Gray to tan marine sandstone and thick coal beds; gold-bearing quartzite conglomerate in lower part.
Battle Spring Formation (Phanerozoic | Cenozoic | Tertiary | Paleocene Eocene): BATTLE SPRING FORMATION--Equivalent to, and lithologically similar to locally derived basin-margin conglomerate of Wasatch Formation; merges southward into main body of Wasatch Formation. Lower part is Paleocene.
Bishop Conglomerate (Phanerozoic | Cenozoic | Tertiary | Oligocene ): BISHOP CONGLOMERATE--Clasts of red quartzite, gray chert, and limestone in a gray to white tuffaceous sandstone matrix.
Camp Davis Formation (Phanerozoic | Cenozoic | Tertiary | Miocene): CAMP DAVIS FORMATION--Upper 5,000 ft chiefly red conglomerate and red claystone; underlain by white tuff, limestone, claystone, and basal gray conglomerate.
Coalmont Formation (Phanerozoic | Cenozoic | Tertiary | Paleocene Eocene): COALMONT FORMATION (EOCENE AND PALEOCENE)--Tan to gray arkosic micaceous soft sandstone, claystone, and locally derived conglomerate.
Conglomerate (Phanerozoic | Cenozoic | Tertiary Quaternary | Miocene Pliocene(?) Pleistocene): CONGLOMERATE--Northwest Wyoming (Jackson Hole) (Pleistocene or Pliocene)--Paleozoic clasts, chiefly of Madison Limestone, in a lithified carbonate matrix; Central (Medicine Bow Mountains) and east Wyoming (east of Laramie Mountains) (Pleistocene to Miocene)--Giant granite boulders in an arkose matrix.
Conglomerate of Roaring Creek (Phanerozoic | Cenozoic | Tertiary | Paleocene Eocene): CONGLOMERATE OF ROARING CREEK (EOCENE OR PALEOCENE; OLDER THAN MAIN PART OF WASATCH FORMATION)--Red and gray conglomerate containing clasts of Mesozoic, Paleozoic, and Precambrian rocks.
Conglomerate of Sublette Range (Phanerozoic | Cenozoic | Tertiary | Paleocene Eocene): CONGLOMERATE OF SUBLETTE RANGE (EOCENE AND PALEOCENE)--Locally derived indurated angular conglomerate.
Crandall Conglomerate (Phanerozoic | Cenozoic | Tertiary | Eocene): CRANDALL CONGLOMERATE--Nonvolcanic conglomerate containing clasts of Lower Paleozoic rocks.
Crooks Gap Conglomerate (Phanerozoic | Cenozoic | Tertiary | Eocene): CROOKS GAP CONGLOMERATE--Giant boulders of granite in arkosic sandstone matrix. Reynolds (1976) considers age of eastern exposures to be Oligocene(?).
Granitic conglomerate above or in upper part of Wasatch Formation (Phanerozoic | Cenozoic | Tertiary | Eocene): GRANITIC CONGLOMERATE ABOVE OR IN UPPER PART OF WASATCH FORMATION--Giant granite boulders in arkosic sandstone matrix. Occurs along west margin of Wind River Range.
Harebell Formation (Phanerozoic | Mesozoic | Cretaceous-Late): HAREBELL FORMATION--Gold-bearing quartzite conglomerate, olive-drab sandstone, and green claystone.
Heart Lake Conglomerate (Phanerozoic | Cenozoic | Tertiary | Pliocene): HEART LAKE CONGLOMERATE--Abundant gray limestone and dolomite clasts and sparse rhyolite and quartzite clasts in a talc and clay matrix.
Hoback Formation (Phanerozoic | Cenozoic | Tertiary | Paleocene ): HOBACK FORMATION--Interbedded drab and gray sandstone and claystone. Locally contains thick red and gray conglomerate.
Ice Point Conglomerate (Phanerozoic | Cenozoic | Tertiary | Eocene): ICE POINT CONGLOMERATE--Reddish-brown conglomerate, chiefly of Paleozoic rock fragments.
Landslide Creek Formation (Phanerozoic | Mesozoic | Cretaceous-Late): LANDSLIDE CREEK FORMATION--Greenish-gray bentonitic tuffaceous sandstone and conglomerate.
Mesaverde Group, Ericson Sandstone (Phanerozoic | Mesozoic | Cretaceous-Late): MESAVERDE GROUP (SOUTH WYOMING). Rock Springs uplift. Ericson Sandstone--White massive sandstone; lenticular chert-grit conglomerate in upper part.
Miocene Rocks (Phanerozoic | Cenozoic | Tertiary | Miocene): MIOCENE ROCKS--Southwest Wyoming: Southern Rock Springs uplift--Pale-green to tan tuffaceous sandstone and claystone of Miocene(?) age. Conglomerate of uncertain correlation locally at base. Saratoga Valley and west and southwest to Colorado--White massive soft tuffaceous sandstone and lesser amounts of white marl; lower part conglomeratic. Underlies North Park Formation in Saratoga Valley. To the west and southwest is called Browns Park Formation. Rawlins area--White massive soft tuffaceous sandstone; Central Wyoming: White soft tuffaceous sandstone. Locally derived conglomerate in upper and lower parts of sequence; in places lower conglomeratic sequence may be of Oligocene age. In Granite Mountains K/Ar age of tuff in lower part of sandstone sequence about 17 Ma and fission-track age of lower conglomerate about 24 Ma.
Pass Peak Formation and Equivalents (Phanerozoic | Cenozoic | Tertiary | Eocene): PASS PEAK FORMATION AND EQUIVALENTS--Includes Lookout Mountain Conglomerate Member of Wasatch Formation. On the south side of Gros Ventre Range consists of gold-bearing quartzite conglomerate; intertongues southward with sandstone and claystone of main body of Wasatch Formation.
Pinyon Conglomerate (Phanerozoic | Mesozoic Cenozoic | Cretaceous-Late Tertiary | Paleocene): PINYON CONGLOMERATE--Brown gold-bearing quartzite conglomerate interbedded with brown and gray sandstone. Age of basal part about 67 Ma in northeastern Jackson Hole; farther south entire sequence is Paleocene.
Red Conglomerate on top of Hoback and Wyoming Ranges (Phanerozoic | Cenozoic | Tertiary | Miocene): RED CONGLOMERATE ON TOP OF HOBACK AND WYOMING RANGES (MIOCENE?; MAY BE AS OLD AS EOCENE)--Locally derived clasts of Mesozoic and Paleozoic rocks in a red clay and sand matrix.
Sandstone and Conglomerate (Phanerozoic | Cenozoic | Tertiary | Oligocene Miocene): SANDSTONE AND CONGLOMERATE--Gray hard coarse-grained sandstone and conglomerate.
Volcanic Conglomerate (Phanerozoic | Cenozoic | Tertiary | Eocene): VOLCANIC CONGLOMERATE--Dark-brown to black conglomerate, poorly bedded, composed chiefly of basalt clasts in a basaltic tuff matrix.
Wagon Bed Formation (Phanerozoic | Cenozoic | Tertiary | Eocene (45-49 Ma)): WAGON BED FORMATION (AGE ABOUT 45 TO 49 Ma)--Southwest and central Wyoming--Green and gray tuffaceous claystone, sandstone, and conglomerate; some uranium-phosphate marlstone and variegated bentonitic claystone. Locally contains oil shale between Wind River and Bighorn Basins; Central Wyoming (west side of Laramie Mountains)--Dull-green siliceous bentonitic claystone and tuff; giant granite boulder conglomerate in tuffaceous matrix.
Wasatch Formation (E) (Phanerozoic | Cenozoic | Tertiary | Eocene): WASATCH FORMATION Moncrief Member--Conglomerate of Precambrian clasts, interbedded with drab sandstone and claystone.
Wasatch Formation (E) (Phanerozoic | Cenozoic | Tertiary | Eocene): WASATCH FORMATION Kingsbury Conglomerate Member--Conglomerate of Paleozoic clasts, interbedded with drab sandstone and variegated claystone.
Wasatch Formation (SW) (Phanerozoic | Cenozoic | Tertiary | Paleocene Eocene): WASATCH FORMATION Main body--Drab sandstone, drab to variegated claystone and siltstone; locally derived conglomerate around basin margins. Lower part is Paleocene.
Wasatch Formation (SW) (Phanerozoic | Cenozoic | Tertiary | Paleocene Eocene): WASATCH FORMATION La Barge and Chappo Members--Red, gray, and brown mudstone and conglomerate and yellow sandstone. La Barge Member tongues out to north at about T. 35 N. Lower part of Chappo is Paleocene.
White River Formation--Upper conglomerate member (Phanerozoic | Cenozoic | Tertiary | Oligocene ): WHITE RIVER FORMATION Upper conglomerate member--Light-gray soft conglomeratic tuffaceous sandstone and conglomerate of Precambrian clasts.
Willwood Formation (Phanerozoic | Cenozoic | Tertiary | Eocene): WILLWOOD FORMATION--Variegated claystone, shale, and sandstone; some lenticular gold-bearing quartzite conglomerate.