Claystone, mudstone, sandstone, and conglomerate
Sandstone and siltstone; in Piceance basin. Formerly Evacuation Creek Member of Green River Fm
Shale, sandstone, marlstone, and limestone in Anvil Points, Garden Gulch, and Douglas Creek Members; in Piceance basin
Parachute Creek Member--Oil shale, marlstone, and siltstone; in Piceance basin
Includes basalts of Hinsdale Fm in San Juan Mountains - Servilleta Fm in San Luis Valley and many other occurrences
Locally includes talus, rock-glacier, and thick colluvial deposits
Sandstone and shale
Dotsero Fm: Dolomite, in White River plateau only. Peerless Fm: sandstone and dolomite.
Shale, limestone, and sandstone. Includes Kerber Fm in south-central
Parting Fm: quartzite and shale.
In northwest and west-central: Intertongues complexly with units of overlying Mesaverde Group or Fm; lower part consists of a calcareous Niobrara equivalent and Frontier Sandstone and Mowry Shale Members; in areas where the Frontier and Mowry Members (Kmfm), or these and the Dakota Sandstone (Kfd) are distinguished, map unit (Km) consists of shale above Frontier Member. In Southwest: Lower part contains Juana Lopez Member (Kmj)
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.
Sandstone and shale; major coal beds in lower part of Mount Garfield
Gypsum, siltstone, and shale; salt present in deep borings. Intertongues with Minturn and Lower Maroon Fms. Diapiric structure in many places
Includes Broadway and Louviers Alluviums
Weber Sandstone and Maroon Fm
Includes Piney Creek Alluvium and younger deposits
Includes some unclassified glacial deposits
Leadville Limestone, Williams Canyon Limestone , Manitou Limestone, and Sawatch Quartzite
Claystone, shale, and sandstone
Sandstone, shale, and major coal beds
In Moffat and Rio Blanco Counties, sandstone, shale, and coal beds above Sego Sandstone. Along Grand Hogback south of Colorado River, sandstone and shale above coal-bearing sequence
Includes Slocum, Verdos, Rocky Flats, and Nussbaum Alluviums in east, and Florida, Bridgetimber, and Bayfield Gravels in southwest
Sandstone and siltstone; west of Park Range
Curtis is absent along Grand Hogback
Arkosic sandstone, siltstone, conglomerate, and local limestone
In isolated patches that may not all be of the same age
Locally includes, at base, Burro Canyon Fm (shale and sandstone) or, in western Moffat County, Cedar Mountain Fm (conglomerate and shale)
Red siltstone and sandstone
Includes Boulder Creek -M.Y. AGE GROUP (AGE 1650-1730 M.Y.)--Includes Boulder Creek, Cross Creek, Denny Creek, Kroenke, Browns Pass, Powderhorn, Pitts Meadow, Bakers Bridge, and Tenmile Granites, Quartz Monzonites, or Granodiorites; also, unnamed granitic rocks
Sandstone and shale. Trout Creek Sandstone Member at top; coal beds in upper half
Includes metabasalt, metatuff, and interbedded metagraywacke; locally contains interlayered biotite gneiss. Derived principally from volcanic rocks
Sandstone, shale, and major coal beds
Dakota Sandstone or Group
Frontier Sandstone and Mowry Shale Members and intervening shale zone
Locally contains minor hornblende gneiss, calc-silicate rock, quartzite, and marble. Derived principally from sedimentary rocks
Morrison Fm and Entrada Sandstone
Along southern Grand Hogback, Chinle is represented only by basal Gartra Sandstone Member
Minturn and Belden Fms
Siltstone, shale, and local gypsum
In dikes and plugs
Eastern Uinta Basin Members of the Green River Formation (Evacuation Creek Mbr, Parachute Creek Mbr (oil shale), Garden Gulch Mbr, and Douglas Creek Mbr.).
Wasatch/Colton Formations and Flagstaff Limestone.
In extreme southwestern Moffat County, includes thin wedge of Carmel Fm (red siltstone and sandstone) beneath Entrada
Mancos Shale (Masuk Shale Mbr, Emery Sandstone Mbr, Blue Gate Shale Mbr, Ferron Sandstone Mbr, and Tununk Shale Mbr).
Older alluvial deposits