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Chugwater and Goose Egg Formations (WYTRPcg;0)
Geologic Formation
in
WY
,
MT
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Lithology
Limestone
Dolostone
Conglomerate
Other
(3,386 mi²)
Geologic Age
Permian – Late Triassic (299.05 Ma – 201.5 Ma ago)
Geologic Unit Label
TRPcg
Chugwater Formation (North Wyoming) - Red siltstone and shale. Alcova Limestone Member in upper middle part in north Wyoming. Thin gypsum partings near base in north and northeast Wyoming. Goose Egg Formation - Red sandstone and siltstone, white gypsum, halite, and purple to white dolomite and limestone. Chugwater Group or Formation (South Wyoming) - Red shale and siltstone containing thin gypsum partings near base. Group includes Popo Agie Formation (red shale and red, yellow, and purple siltstone; lenses of lime-pellet conglomerate), Crow Mountain Sandstone (red and gray, thick bedded), Alcova Limestone, and Red Peak Formation (red siltstone and shale). Chugwater Formation includes as members all the units listed above. Includes overlying Jelm Formation in Shirley and Seminoe Mountains and at northern end of Laramie Basin. Jelm Formation - Red sandstone.
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Geologic Formation
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