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Faulted mountains formed from quartzite, siltite, and argillite. Intrusions of granite occur near the Idaho batholith as well as borderzone materials. Elevations range from 2200 to 7800 feet. Drainage density is moderate to high.
Mean annual precipitation ranges from 25 to 80 inches, about 50 percent falling as snow. The soil temperature and moisture regimes are frigid (cryic at higher elevations) and udic. Rain on snow events occur.
Cedar-hemlock-pine forest with Douglas-fir forest at higher elevations.
Landform | Geology | Soil Taxa |
---|---|---|
Mountainsides | Metasedimentary | Udivitrands/Cryandepts |
Glaciated ridges/slopes/cirquelands | Metasedimentary | Haplocryands/Fulvicryands |
Valley floors/fans/terraces | Alluvium | Vitrands/Aquands/Aquepts/Boralfs |
The primary natural disturbances are fire, insects, disease, and flooding. Land use is predominantly intensive timber harvest and mining.