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Steep, dissected river breaks formed in clay shale, sandstone, and siltstone. Erosion is the dominant geomorphic process. Elevations range from 1800 to 4400 feet. Drainage density is high. Fort Peck Reservoir occurs here.
Mean annual precipitation ranges from 10 to 15 inches, about 20 to 30 percent falling as snow. The soil temperature and moisture regimes are frigid and aridic ustic.
Eastern ponderosa forest
Landform | Geology | Soil Taxa |
---|---|---|
River breaks | Sedimentary | Torriorthents |
The primary natural disturbance is erosion. Land use is predominantly livestock grazing and wildlife habitat.