Gypsum Spring Formation, Nugget Sandstone, and Chugwater Formation (WYJTRgc;0)

GYPSUM SPRING FORMATION, NUGGET SANDSTONE, AND CHUGWATER FORMATION. GYPSUM SPRING FORMATION--Interbedded red shale, dolomite, and gypsum. In north Wyoming wedges out south in T. 39 N. NUGGET SANDSTONE--gray to dull-red, crossbedded quartz sandstone. CHUGWATER FORMATION--Red siltstone and shale. Alcova Limestone Member in upper middle part in north Wyoming. Thin gypsum partings near base in north and northeast Wyoming.

State	Wyoming
Name	Gypsum Spring Formation, Nugget Sandstone, and Chugwater Formation
Geologic age	Phanerozoic \| Mesozoic \| Triassic-Early Triassic-Middle(?) Triassic-Late(?) Jurassic-Early(?) Jurassic-Middle(?) Jurassic-Late
Original map label	J@gc
Primary rock type	fine-grained mixed clastic
Secondary rock type	carbonate
Other rock types	dolostone (dolomite); evaporite
Lithologic constituents	Minor Sedimentary > Clastic > Siltstone Sedimentary > Carbonate > Dolostone Sedimentary > Clastic > Mudstone > Shale Sedimentary > Clastic > Sandstone Incidental Sedimentary > Chemical > Evaporite > Gypsum Sedimentary > Carbonate > Limestone
Map references	Love, J.D. and Christiansen, Ann Coe, 1985, Geologic Map of Wyoming: U.S. Geological Survey. [http://pubs.er.usgs.gov/publication/ofr83802]
Unit references	Love, J.D. and Christiansen, Ann Coe, 1985, Geologic Map of Wyoming: U.S. Geological Survey. [http://pubs.er.usgs.gov/publication/ofr83802]
Geographic coverage	Washakie