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Green River Formation - Wilkins Peak Member and Tipton Shale member or Tongue

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Wilkins Peak Member - green, brown, and gray tuffaceous sandstone, shale, and marlstone; contains evaporites in subsurface sections. Tipton Shale Member or Tongue - oil shale and marlstone.
State Wyoming
Name Green River Formation - Wilkins Peak Member and Tipton Shale member or Tongue
Geologic age Eocene
Lithologic constituents
Major
Sedimentary > Clastic > Sandstone
Sedimentary > Carbonate > Marlstone
Sedimentary > Clastic > Mudstone > Shale
Minor
Sedimentary > Clastic > Mudstone > Shale > Oil-shale
Incidental
Sedimentary > Chemical > Evaporite
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 Sweetwater