Fort Union Formation

Fort Union Formation
Stratigraphic range: Maastrichtian-Selandian (Lancian-Clarkforkian) ~66–58 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Fossils from the Fort Union Formation
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
Coordinates	47°00′N 104°36′W / 47.0°N 104.6°W / 47.0; -104.6
Approximate paleocoordinates	52°48′N 80°06′W / 52.8°N 80.1°W / 52.8; -80.1
Region	Montana, North Dakota Wyoming, Colorado
Country	United States
Extent	Powder River Basin

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]