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White River Formation - Chadron Member

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Light-gray to dark-red tuffaceous claystone, sandstone, and lenticular conglomerate.
State Wyoming
Name White River Formation - Chadron Member
Geologic age Oligocene
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone > Claystone (Tuffaceous)
Sedimentary > Clastic > Sandstone (Tuffaceous)
Sedimentary > Clastic > Conglomerate (Lens)
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 Goshen - Platte