Tongue River Member

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Tongue River Member
Stratigraphic range: Paleogene
Massive machinery at work in the open-pit Wyodak coal mine in the coal-rich Powder River Basin outside Gillette, Wyoming LCCN2015634185.tif
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]

See also

References

  1. ↑ 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.
  2. ↑ 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.
  3. ↑ Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database" . Retrieved 17 December 2021.
Sandstone and mudstone of the Tongue River Member, Fort Union Formation. Tongue River Mbr 2.jpg
Sandstone and mudstone of the Tongue River Member, Fort Union Formation.


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Mudstones and sandstone, Tongue River Member, exposed in a roadcut, US Highway 87 Tongue River Mbr 1.jpg
Mudstones and sandstone, Tongue River Member, exposed in a roadcut, US Highway 87
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