Fort Union Formation
Geologic formation in the northwestern United States / From Wikipedia, the free encyclopedia
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The Fort Union Formation is a geologic unit containing sandstones, shales, and coal beds in Wyoming, Montana, and parts of adjacent states. In the Powder River Basin, it contains important economic deposits of coal, uranium, and coalbed methane.[1]
Quick Facts Type, Sub-units ...
Fort Union Formation | |
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Stratigraphic range: Maastrichtian-Selandian (Lancian-Clarkforkian) ~66–58 Ma | |
Type | Geological formation |
Sub-units | Atwell Gulch, China Butte, Ekalaka, Lebo, lower Ludlow, Overland, Rock Bench Quarry, Sentinel Butte, Shotgun, Somber beds, Tongue River, Tullock, upper Ludlow, Polecat Bench Formation |
Underlies | Wasatch Formation |
Overlies | Hell Creek Formation, Lance Formation |
Lithology | |
Primary | Sandstone, shale |
Other | Coal |
Location | |
Region | Montana, North Dakota Wyoming, Colorado |
Country | United States |
Extent | Powder River Basin |
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