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Thrust faulted mountains that formed from shale, sandstone, limestone, and conglomerate. These mountains have been strongly shaped by alpine glaciation. Elevations range from 3680 to 8500 feet. Drainage density is moderate. A few lakes occur in glacial cirque basins.
Mean annual precipitation ranges from 20 to 90 inches, about 80 percent falling as snow. The soil temperature and moisture regimes are cryic and udic.
Douglas-fir forest and Western spruce-fir forest
Landform | Geology | Soil Taxa |
---|---|---|
Mountainsides | Till/volcanic ash/sedimentary rock | Cryoboralfs/Eutroboralfs |
Valleys | Alluvium/outwash | Eutrocrepts/Cryoboralfs/Udifluvents |
Alpine ridges/cirquelands | Sedimentary rock/till | Cryochrepts |
The primary natural disturbances are fire, insects, and windthrow. This subsection is almost entirely wilderness, therefore, human disturbances are very minor.