Tongue River  search
RTNorth Dakota
 Montana
 Wyoming
 Yellowstone River
SNTributary of the Yellowstone River, N central Wyoming and SE Montana. Also a tributary of the Pembina River, NE North Dakota. Indexed with counties and states as applicable. Added to Thesaurus in 1985.
Tongue River Member  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Cenozoic
 ...Paleogene
 ....Paleocene
 .....Tongue River Member
RTWyoming
 Montana
 North Dakota
 South Dakota
 Fort Union Formation
SNIn Fort Union Formation. In Montana and North Dakota, composed of light-yellow, tan, and gray sandstones and shales; thin lenses of limestone; and numerous beds of lignite. Found in E Montana, SW North Dakota, South Dakota and NW Wyoming.