| State | Montana |
|---|---|
| Name | Tongue River Member of Fort Union Formation |
| Geologic age | Tertiary |
| Lithologic constituents |
Major
Sedimentary > Clastic > Mudstone > Shale (Bed, Carbonaceous)sandy and silty shale
Sedimentary > Clastic > Sandstone (Bed)
Minor
Sedimentary > Coal (Bed)
|
| References | Vuke, S.M., Porter, K.W., Lonn, J.D., and Lopez, D.A., 2007, Geologic Map of Montana - Compact Disc: Montana Bureau of Mines and Geology: Geologic Map 62-C, 73 p., 2 sheets, scale 1:500,000. This map was digitized in 2012 as a result of a contract between the U.S. Geological Survey and the Montana Bureau of Mines and Geology. |
| NGMDB product | |
| Counties | Big Horn - Carbon - Carter - Custer - Daniels - Dawson - Fallon - Garfield - Golden Valley - McCone - Musselshell - Powder River - Prairie - Richland - Roosevelt - Rosebud - Sheridan - Stillwater - Sweet Grass - Treasure - Valley - Wheatland - Wibaux - Yellowstone |