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Complex faulted mountains and foothills that formed in gneiss, volcanic, and a variety of sedimentary bedrock. Elevations range from 4200 to 8000 feet. Drainage density is high.
Mean annual precipitation ranges from 10 to 25 inches, about 35 percent falling as snow. The soil temperature and moisture regimes are frigid (cryic at higher elevations) and aridic ustic.
Douglas-fir forest/Foothills prairie
Landform | Geology | Soil Taxa |
---|---|---|
Mountainsides/ridges | Sedimentary/metasedimentary | Cryoboralfs/Cryochrepts/Cryoborolls |
Foothills | Gneiss/volcanic/metasedimentary | Ustochrepts/Argiborolls/Haploborolls/Camborthids |
The primary natural disturbance is fire. Land use is predominantly livestock grazing and timber harvest.