Green River Fm--Lower Part

Shale, sandstone, marlstone, and limestone in Anvil Points, Garden Gulch, and Douglas Creek Members; in Piceance basin
State Colorado
Name Green River Fm--Lower Part
Geologic age Tertiary
Lithologic constituents
Sedimentary > Carbonate > Marlstone
Sedimentary > Clastic > Mudstone > Shale
Sedimentary > Clastic > Sandstone
Sedimentary > Carbonate > Limestone

Tweto, Ogden, 1979, Geologic Map of Colorado: U.S. Geological Survey Special Geologic Map, scale 1:500,000.

NGMDB product
Counties Garfield - Mesa - Moffat - Rio Blanco