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The Tongue River Member is the uppermost geologic member of the
{{Paleogene-stub
Mudstones and sandstone, Tongue River Member, exposed in a roadcut, US Highway 87
Fort Union Formation
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.
...
in Montana, North Dakota
North Dakota () is a U.S. state in the Upper Midwest, named after the indigenous Dakota Sioux. North Dakota is bordered by the Canadian provinces of Saskatchewan and Manitoba to the north and by the U.S. states of Minnesota to the east, So ...
, Wyoming
Wyoming () is a state in the Mountain West subregion of the Western United States. It is bordered by Montana to the north and northwest, South Dakota and Nebraska to the east, Idaho to the west, Utah to the southwest, and Colorado to the s ...
. The strata are yellow or light-colored massive sandstones and numerous thick coal beds.
The vertebrate fossil fauna includes fishes, turtles, crocodiles, and mammals. Mammalian genera known from rocks of both the Torrejonian and the Tiffanian land mammal ages (middle and late Paleocene) are present.
See also
* List of fossiliferous stratigraphic units in North Dakota * Paleontology in North Dakota *Paleontology in Wyoming
Paleontology in Wyoming includes research into the prehistoric life of the U.S. state of Wyoming as well as investigations conducted by Wyomingite researchers and institutions into ancient life occurring elsewhere. The fossil record of the US sta ...
References
Paleogene Montana Paleogene geology of North Dakota
{{Paleogene-stub
Mudstones and sandstone, Tongue River Member, exposed in a roadcut, US Highway 87
