| 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 |