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Sundance and Gypsum Spring Formations and Nugget Sandstone

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Sundance Formation (Js) - Greenish-gray glauconitic sandstone and shale, underlain by red and gray nonglauconitic sandstone and shale. Gypsum Spring Formation - Interbedded red shale, dolomite, and gypsum. In north Wyoming wedges out south in T. 39 N. Nugget Sandstone (JTRn) - Gray to dull-red, crossbedded quartz sandstone.
State Wyoming
Name Sundance and Gypsum Spring Formations and Nugget Sandstone
Geologic age Jurassic(?) and Triassic(?) to Upper Jurassic
Lithologic constituents
Major
Sedimentary > Carbonate > Dolostone
Sedimentary > Clastic > Mudstone > Shale
Sedimentary > Clastic > Sandstone (Glauconitic)
Incidental
Sedimentary > Chemical > Evaporite > Gypsum
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 Fremont - Hot Springs - Teton