| Tongue River Member | |
|---|---|
| Stratigraphic range: Paleogene | |
 Mining the coal-rich Tongue River Member, Fort Union Formation (Wyodak coal mine, Powder River Basin, Wyoming) | |
| Type | Member |
| Unit of | Fort Union Formation |
| Overlies | Lebo Member |
| Location | |
| Region | North Dakota, Wyoming |
| Country | United States |
The Tongue River Member is the uppermost geologic member of the Fort Union Formation in Montana, North Dakota, Wyoming.[1] The strata are yellow or light-colored massive sandstones and numerous thick coal beds.[2]
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.[3]
- ^ N. M. Denson; J. H. Dover; L. M. Osmonson (1978). "Lower Tertiary coal bed distribution and coal resources of the Reno Junction-Antelope Creek area, Campbell, Converse, Niobrara, and Weston counties, Wyoming". Miscellaneous Field Studies Map. 960. doi:10.3133/MF960. Wikidata Q62118849.
- ^ Thom, W.T., Jr., and Dobbin, C.E., 1924, Stratigraphy of Cretaceous-Eocene transition beds in eastern Montana and the Dakotas: Geological Society of America Bulletin, v. 35, no. 9, p. 481-505.
- ^ Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 17 December 2021.