|Name||Upper Tertiary sediment or sedimentary rock|
Sedimentary > Clastic > Sandstone (Tuffaceous)
Sedimentary > Clastic > Siltstone (Tuffaceous)
Sedimentary > Clastic > Conglomerate
Sedimentary > Carbonate > Marlstone
Igneous > Volcanic (Pyroclastic, Flow)ash beds, Local volcanic flows in southwestern Montana
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||Beaverhead - Broadwater - Gallatin - Granite - Jefferson - Madison - Meagher - Missoula - Ravalli - Silver Bow|