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Frontier Sandstone and Mowry Shale Members of Mancos Shale, and Dakota Sandstone

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Locally includes, at base, Burro Canyon Fm (shale and sandstone) or, in western Moffat County, Cedar Mountain Fm (conglomerate and shale)
State Colorado
Name Frontier Sandstone and Mowry Shale Members of Mancos Shale, and Dakota Sandstone
Geologic age Cretaceous
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone > Shale
Sedimentary > Clastic > Sandstone
Minor
Sedimentary > Clastic > Conglomerate
References

Tweto, Ogden, 1979, Geologic Map of Colorado: U.S. Geological Survey Special Geologic Map, scale 1:500,000.
NGMDB product
Counties Garfield - Moffat - Pitkin - Rio Blanco - Routt