Pierre Shale--Upper unit

Pierre Shale--Upper unit
State Colorado
Name Pierre Shale--Upper unit
Geologic age Cretaceous
Lithologic constituents
Major
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 Adams - Arapahoe - Boulder - Cheyenne - Crowley - Douglas - Elbert - El Paso - Fremont - Jefferson - Kit Carson - Larimer - Lincoln - Logan - Morgan - Pueblo - Washington - Weld - Yuma