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Sundance Formation

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Greenish-gray glauconitic sandstone and shale, underlain by red and gray nonglauconitic sandstone and shale.
State Wyoming
Name Sundance Formation
Geologic age Middle Jurassic-Upper Jurassic
Lithologic constituents
Major
Sedimentary > Clastic > Sandstone (Glauconitic)
Sedimentary > Clastic > Mudstone > Shale
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 Albany - Carbon - Converse - Fremont - Natrona - Niobrara - Platte - Washakie