Snowcrest Range Group: Conover Ranch, Lombard, and Kibbey Formations

Conover Ranch Formation: Red siltstone and mudstone with minor silty limestone and sandstone beds. Thickness 35 m (115 ft). Lombard Formation: Gray, silty limestone with minor black shale. Thickness 120 m (394 ft). Kibbey Formation: Yellow siltstone, sandstone, and mudstone with minor silt limestone in lower part. Thickness 80 m (262 ft).
State Montana
Name Snowcrest Range Group: Conover Ranch, Lombard, and Kibbey Formations
Geologic age Pennsylvanian and Mississippian
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone (Bed)
Sedimentary > Carbonate > Limestone (Bed)
Sedimentary > Clastic > Siltstone (Bed)
Minor
Sedimentary > Clastic > Sandstone (Bed)
Sedimentary > Clastic > Mudstone > Shale > Black-shale (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 Beaverhead - Madison