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Billman Creek Formation

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Livingston Group. Olive gray, grayish brown, and dusky red tuffaceous claystone interbedded with subordinate grayish yellow sandstone, conglomeratic sandstone, and siltstone beds. Fluvial and lacustrine. May be brackish in part. Thickness as much as 915 m (3,002 ft).
State Montana
Name Billman Creek Formation
Geologic age Cretaceous
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone > Claystone (Bed, Tuffaceous)
Minor
Sedimentary > Clastic > Siltstone (Bed)
Sedimentary > Clastic > Mixed-clastic > Conglomerate-sandstone (Bed)
Sedimentary > Clastic > Sandstone (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 - Meagher - Park