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Meeteetse Formation and Lewis Shale

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Meeteetse Formation (Km) - Chalky-white to gray sandstone, yellow, green, and dark-gray bentonitic claystone, white tuff, and thin coal beds. Lewis Shale (Kle) - Gray marine shale containing many gray and brown lenticular concretion-rich sandstone beds.
State Wyoming
Name Meeteetse Formation and Lewis Shale
Geologic age Upper Cretaceous
Lithologic constituents
Major
Sedimentary > Clastic > Sandstone
Sedimentary > Clastic > Mudstone > Shale
Sedimentary > Clastic > Mudstone > Claystone
Incidental
Sedimentary > Coal
Igneous > Volcanic (Pyroclastic-tuff)
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 Fremont - Natrona