Hoppers Formation

Livingston Group. Olive gray and yellowish gray, volcaniclastic sandstone, conglomeratic sandstone, and subordinate olive gray mudstone. Channel fill and floodplain. Thickness as much as 765 m (2,510 ft).
State Montana
Name Hoppers Formation
Geologic age Cretaceous
Lithologic constituents
Major
Sedimentary > Clastic > Mixed-clastic > Conglomerate-sandstone (Bed)
Sedimentary > Clastic > Sandstone (Tuffaceous)
Minor
Sedimentary > Clastic > Mudstone (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 Gallatin - Park