Landscape Characteristics: Mountain front foothills, moraines, fans, and terraces that formed in calcareous shales overlain by till, outwash, alluvium, and terrace deposits. The landscape has been modified by glaciation. Elevations range from 3,400 to 6,000 feet. Drainage density is low to moderate.Climate: Mean annual precipitation ranges from 12 to 20 inches, about half falling as snow. The soil temperature and moisture regimes are frigid and typic ustic. Chinook winds are frequent.
Potential Vegetation: Wheatgrass-fescue-needlegrass
Relationships of Dominant MapUnit Components: Landform Geology Soil Taxa Foothills/moraines Till Haploborolls/ Ustorthents Fans/terraces Calcareous outwash Argiborolls/Calciborolls Disturbance and Land Use: The primary natural disturbance is fire. Land use is predominantly livestock grazing. 331Db Montana Isolated Mountain Ranges Landscape Characteristics: Mountainsides, foothills, terraces, moraines, and fans that formed in Tertiary volcanics and mixed sedimentary rocks. Continental glaciation influenced these mountain ranges. Elevations range from 2,500 to 5,500 feet. Drainage density is moderate.Climate: Mean annual precipitation ranges from 16 to 30 inches, about 70 percent falling as snow. The soil temperature and moisture regimes are frigid (cryic at higher elevations) and typic ustic. Chinook winds are common.10 Potential Vegetation:Douglas-fir forest at higher elevations with foothills prairie on foothill and lower elevations.
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