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White River Formation - Brule Member

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Pale-pink to white blocky tuffaceous claystone and lenticular sandstone. Locally includes the Upper Conglomerate Member (Twru).
State Wyoming
Name White River Formation - Brule Member
Geologic age Oligocene
Lithologic constituents
Major
Sedimentary > Clastic > Sandstone (Lens)
Sedimentary > Clastic > Mudstone > Claystone (Tuffaceous)
Minor
Sedimentary > Clastic > Conglomerate
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 - Laramie - Platte