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M332Dn North Tobacco Root Mountains and Foothills

Landscape Characteristics:

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.

Climate:

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.

Potential Vegetation:

Douglas-fir forest/Foothills prairie

Relationships of Dominant Map Unit Components:

Landform Geology Soil Taxa
Mountainsides/ridges Sedimentary/metasedimentary Cryoboralfs/Cryochrepts/Cryoborolls
Foothills Gneiss/volcanic/metasedimentary Ustochrepts/Argiborolls/Haploborolls/Camborthids

Disturbance and Land Use:

The primary natural disturbance is fire. Land use is predominantly livestock grazing and timber harvest.