Sedimentary > Clastic > Sandstone (Bed)
Sedimentary > Clastic > Mixed-clastic > Sandstone-mudstone (Bed)sandy shale
Sedimentary > Coal (Bed)
Unconsolidated > Coarse-detritalChert-pebble lag deposit common at top of formation
Sedimentary > Carbonate (Bed)thin carbonaceous beds at top of member
Sedimentary > Chemical > Chert (Bed)Chert-pebble lag deposit common at top of formation
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.
|Counties||Big Horn - Blaine - Carbon - Chouteau - Fergus - Garfield - Golden Valley - Hill - Liberty - Meagher - Musselshell - Petroleum - Phillips - Stillwater - Toole - Wheatland - Yellowstone|