Beaverhead Group

Reddish gray conglomerate with limestone and quartzite clasts, gray limestone, and grayish brown sandstone. Syntectonic alluvial fan and braided stream. Thickness as much as 3,250 m (10,663 ft).
State Montana
Name Beaverhead Group
Geologic age Tertiary and Cretaceous
Lithologic constituents
Major
Sedimentary > Clastic > Sandstone
Sedimentary > Clastic > Conglomerate
Sedimentary > Carbonate > Limestone
Minor
Metamorphic > Metasedimentary > Metaclastic > Quartzitequartzite clasts in conglomerate
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 Beaverhead - Madison