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Tullock Member of Fort Union Formation

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Yellow sandstone interbedded with subordinate grayish brown and black shale and thin beds of coal. Alluvial plain. Thickness as much as 180 m (590 ft).
State Montana
Name Tullock Member of Fort Union Formation
Geologic age Tertiary
Lithologic constituents
Major
Sedimentary > Clastic > Sandstone (Bed)
Minor
Sedimentary > Clastic > Mudstone > Shale > Black-shale (Bed)
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 - Fergus - Garfield - Golden Valley - McCone - Musselshell - Petroleum - Phillips - Powder River - Prairie - Richland - Roosevelt - Rosebud - Sheridan - Stillwater - Sweet Grass - Toole - Treasure - Valley - Wheatland - Yellowstone