State | Montana |
---|---|
Name | Judith River and Claggett Formations |
Geologic age | Cretaceous |
Lithologic constituents |
Major
Sedimentary > Clastic > Sandstone (Bed)
Sedimentary > Clastic > Mudstone > Shale (Bed)
Sedimentary > Clastic > Mudstone > Shale > Black-shale (Bed, Carbonaceous)
Minor
Sedimentary > Clastic > Mixed-clastic > Siltstone-mudstone (Bed)silty shale
Incidental
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 | Chouteau - Fergus - Garfield - Judith Basin - Musselshell - Petroleum |