Alluvial fan deposit

Variable deposits with fan-shaped morphology developed where slope gradient changes abruptly. Shown only where relatively extensive.
State Montana
Name Alluvial fan deposit
Geologic age Quaternary
Lithologic constituents
Unconsolidated (Alluvial)Variable deposits with fan-shaped morphology

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 - Gallatin - Jefferson - Madison - Silver Bow