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Pierre Shale--Middle unit

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In Boulder-Fort Collins area, contains Richard, Larimer, Rocky Ridge, Terry, and Hygiene Sandstone Members; elsewhere shale between zones of Baculites reesidei and B. scotti
State Colorado
Name Pierre Shale--Middle unit
Geologic age Cretaceous
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone > Shale
Minor
Sedimentary > Clastic > Sandstone
References

Tweto, Ogden, 1979, Geologic Map of Colorado: U.S. Geological Survey Special Geologic Map, scale 1:500,000.
NGMDB product
Counties Boulder - Cheyenne - Crowley - Douglas - El Paso - Fremont - Jefferson - Kiowa - Kit Carson - Larimer - Lincoln - Pueblo