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Mineral Resources On-Line Spatial Data

Jelm and Chugwater Formations, Forelle Limestone, and Satanka Shale

JELM AND CHUGWATER FORMATIONS, FORELLE LIMESTONE, AND SATANKA SHALE. CHUGWATER FORMATION OR GROUP--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. FORELLE LIMESTONE--Thin-bedded limestone. Locally is a member of the Goose Egg Formation. SATANKA SHALE--Red shale.
StateWyoming
NameJelm and Chugwater Formations, Forelle Limestone, and Satanka Shale
Geologic agePhanerozoic | Paleozoic Mesozoic | Permian Triassic-Early
Original map label@Pjs
CommentsArrows show range from mid Permian to top of Triassic
Primary rock typefine-grained mixed clastic
Secondary rock typemedium-grained mixed clastic
Other rock typesmixed clastic/carbonate; evaporite
Lithologic constituents
Major
Sedimentary > Clastic > Siltstone
Sedimentary > Clastic > Mudstone > Shale
Minor
Sedimentary > Carbonate > Limestone
Sedimentary > Clastic > Sandstone
Sedimentary > Clastic > Conglomerate
Incidental
Sedimentary > Chemical > Evaporite > Gypsum
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 coverageAlbany

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