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Gypsum Spring Formation, Nugget Sandstone, and Chugwater Formation

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.
StateWyoming
NameGypsum Spring Formation, Nugget Sandstone, and Chugwater Formation
Geologic agePhanerozoic | Mesozoic | Triassic-Early Triassic-Middle(?) Triassic-Late(?) Jurassic-Early(?) Jurassic-Middle(?) Jurassic-Late
Original map labelJ@gc
Primary rock typefine-grained mixed clastic
Secondary rock typecarbonate
Other rock typesdolostone (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.
Unit references
Love, J.D. and Christiansen, Ann Coe, 1985, Geologic Map of Wyoming: U.S. Geological Survey.
Geographic coverageWashakie

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