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Pierre Shale

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Dark-gray concretionary marine shale; contains several bentonite beds.
State Wyoming
Name Pierre Shale
Geologic age Upper Cretaceous
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone > Shale
Minor
Sedimentary > Clastic > Mudstone > Claystone > Bentonite
References

Love, J.D. and Christiansen, A.C., 1985, Geologic Map of Wyoming: U.S. Geological Survey, scale 1:500,000.

https://pubs.er.usgs.gov/publication/70046739
NGMDB product
Counties Campbell - Crook - Laramie - Niobrara - Weston