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Wasatch Fm (including Fort Union equivalent at base) and Ohio Creek Fm

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Claystone, mudstone, sandstone, and conglomerate
State Colorado
Name Wasatch Fm (including Fort Union equivalent at base) and Ohio Creek Fm
Geologic age Tertiary
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone > Claystone
Minor
Sedimentary > Clastic > Mudstone
Sedimentary > Clastic > Sandstone
Sedimentary > Clastic > Conglomerate
Sedimentary > Clastic > Mudstone > Shale
References

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