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M332Ac Central Idaho Mountains and Basins

Landscape Characteristics:

Uplands, broad basins, and breaklands that formed gneiss, schist, and granitic rocks. Volcanic ash caps occur throughout the area. Elevations range from 1600 to 8200 feet. Drainage density is moderate to high. Wetlands occur throughout the subsection associated with glacial till. Lakes occur in high elevation cirques.

Climate:

Mean annual precipitation ranges from 25 to 80 inches, about 60 percent falling as snow. The soil temperature and moisture regimes are cryic and udic.

Potential Vegetation:

Western spruce-fir forest/Grand fir-Douglas-fir forest

Relationships of Dominant Map Unit Components:

Landform Geology Soil Taxa
Uplands/cirquelands Granitic rocks/till Cryochrepts/Vitricryands/Dystrochrepts/Cryoboralfs
Basins/terraces/floodplains Till/colluvium/alluvium Aquands/Cryands/Cryochrepts/Dystrochrepts
Breaklands Granitic rocks/colluvium Dystrochrepts/Haploxerolls

Disturbance and Land Use:

The primary natural disturbances are fire, insects, disease, and mass wasting. Land use is predominantly timber harvest and mining.