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Intermontane basins and broad valleys that formed in alluvium, glacial deposits, and Tertiary volcanic materials. Elevations range from 4700 to 7600 feet. Drainage density is low.
Mean annual precipitation ranges from 9 to 20 inches, about 10 percent falling as snow. The soil temperature and moisture regimes are frigid and aridic ustic. Parts of the Red Rock Basin and Big Hole Valley have cryic temperature regimes.
Sagebrush steppe
Landform | Geology | Soil Taxa |
---|---|---|
Valley floor | Alluvium | Haploborolls/Calciorthids/Torriorthents/Cryaquolls |
Terraces/foothills | Alluvium/till/volcanic deposits | Cryoborolls/Cryochrepts |
The primary natural disturbances are flooding and fire. Land use is predominantly livestock grazing, agriculture, and urban/suburban development.