Upper part of Dawson Arkose

Arkosic sandstone, conglomerate, and shale. Includes Green Mountain Conglomerate south of Golden
State Colorado
Name Upper part of Dawson Arkose
Geologic age Tertiary
Lithologic constituents
Sedimentary > Clastic > Mudstone > Shale
Sedimentary > Clastic > Conglomerate
Sedimentary > Clastic > Sandstone > Arkose

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

NGMDB product
Counties Arapahoe - Douglas - Elbert - El Paso - Jefferson