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Tatman Formatin

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Drab nontuffaceous claystone, oil shale, lignite, and sandstone.
State Wyoming
Name Tatman Formatin
Geologic age Eocene
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone > Shale > Oil-shale
Sedimentary > Clastic > Mudstone > Claystone
Sedimentary > Coal > Lignite
Minor
Sedimentary > Clastic > Sandstone
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 Big Horn - Hot Springs - Park - Washakie