Tongue River Member

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]

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 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

• Earth sciences portal
• Paleontology portal

• List of fossiliferous stratigraphic units in North Dakota
• Paleontology in North Dakota
• Paleontology in Wyoming