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Washakie Formation

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Gray, green, tan, and dull-red tuffaceous arkosic sandstone and claystone.
State Wyoming
Name Washakie Formation
Geologic age Eocene
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone > Claystone (Tuffaceous)
Sedimentary > Clastic > Sandstone (Tuffaceous)
Incidental
Igneous > Volcanic (Pyroclastic-tuff)
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 Carbon - Sweetwater