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Mountains formed from quartzite and argillite. Elevations range from 2300 to 7500 feet. Drainage density is moderate. Some lakes occur in high elevation cirques.
Mean annual precipitation ranges from 25 to 80 inches, about 50 percent falling as snow. The soil temperature and moisture regimes are frigid and typic ustic. Some cryic/udic regimes occur at higher elevations.
Western ponderosa forest/Douglas-fir forest
Landform | Geology | Soil Taxa |
---|---|---|
Mountainsides/ridges | Quartzite/argillite | Xerochrepts/Eutrochrepts/Vitrandepts |
Valley floor/fans/terraces | Alluvium | Xerochrepts/Eutrochrepts/Vitrandepts |
The primary natural disturbances are fire, insects, disease, and flooding. Land use is predominantly urban/suburban development, timber harvest, mining, and some grazing.