Sundance and Gypsum Spring Formations (WYJsg;0)

Sundance and Gypsum Spring Formations

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.

State	Wyoming
Name	Sundance and Gypsum Spring Formations
Geologic age	Middle Jurassic-Upper Jurassic
Lithologic constituents	Major Sedimentary > Clastic > Mudstone > Shale Sedimentary > Clastic > Sandstone (Glauconitic) Sedimentary > Carbonate > Dolostone 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	NGMDB product page for 16366
Counties	Big Horn - Crook - Fremont - Hot Springs - Johnson - Natrona - Niobrara - Park - Sheridan - Sublette - Teton - Washakie - Weston

Sundance and Gypsum Spring Formations

Love, J.D. and Christiansen, A.C., 1985, Geologic Map of Wyoming: U.S. Geological Survey, scale 1:500,000.