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Steele Shale

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Gray soft marine shale containing numerous bentonite beds and thin lenticular sandstone.
State Wyoming
Name Steele Shale
Geologic age Upper Cretaceous
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone > Shale
Minor
Sedimentary > Clastic > Sandstone
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 Albany - Carbon - Natrona