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

Claystone, mudstone, sandstone, and conglomerate
State Colorado
Name Wasatch Fm (including Fort Union equivalent at base) and Ohio Creek Fm
Geologic age Phanerozoic | Cenozoic | Tertiary
Primary rock type mudstone
Secondary rock type sandstone
Other rock types shale; conglomerate
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone > Claystone
Minor
Sedimentary > Clastic > Sandstone
Sedimentary > Clastic > Mudstone
Sedimentary > Clastic > Mudstone > Shale
Sedimentary > Clastic > Conglomerate
Map references
Tweto, Ogden 1979, Geologic Map of Colorado: U.S. Geological Survey Special Geologic Map, scale 1:500,000.
Unit references
Tweto, Ogden 1979, Geologic Map of Colorado: U.S. Geological Survey Special Geologic Map, scale 1:500,000.
Counties Delta - Garfield - Gunnison - Mesa - Rio Blanco