Chugwater Formation
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The Chugwater Formation is a mapped bedrock unit consisting primarily of red sandstone, in the states of Wyoming, Montana, and Colorado in the United States. It is recognized as a geologic formation in Colorado and Montana, but as a Group (set of formations), the Chugwater Group, in Wyoming. Despite its presence below the highly studied Morrison Formation, the Chugwater receives little attention.
Quick Facts Type, Underlies ...
Chugwater Formation (Group) | |
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Stratigraphic range: Triassic | |
Type | sedimentary |
Underlies | Nugget Sandstone, Morrison Formation |
Overlies | Dinwoody Formation, Goose Egg Formation |
Lithology | |
Primary | sandstone |
Other | shale, gypsum, limestone |
Location | |
Extent | Wyoming, Colorado, Montana |
Type section | |
Named for | Chugwater, Wyoming |
Named by | N. H. Darton, 1904[1] |
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