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75 -Torriorthents -Rock outcrop, sandstone, complex <br />75 •Torriorthents -Rock outcrop, sandstone, complex <br />SETTING <br />Landforms: mountain sides, foot slopes <br />Elevation: 5,000 to 8,000 feet <br />Mean annual air temperature: 46 to 50 degrees F <br />Mean annual precipitation : 12 to I6 inches <br />Frost free period: 90 to 120 days <br />CHARACTERISTICS OF THE TORRIORTHENTS SOIL <br />Parent material: residuum and colluvium from shale, sandstone, limestone or siltstone with basalt <br />overburden in some areas. <br />Dominant native plants: Indian ricegrass, western wheatgrass, prairie junegrass, scarlet Indian <br />paintbrush <br />Typical Profle <br />Little to no profile development <br />Depth class: deep <br />Drainage class: well drained <br />Permeability: moderately slow to rapid <br />Available water capacity: low to moderate <br />Potential rooting depth : 60 or more inches <br />Surtace runoff: moderate <br />Hazard of water erosion: high <br />Shrink•swell potential: moderate <br />Mass movement potential: moderate to high <br />CHARACTERISTICS OF THE ROCK OUTCROP <br />Rock outcrop consists of large exposures of shale parallel to the surface and as cliffs, breaks, or <br />escarpments. <br />COMPOSITION <br />Torriorthents: 60 percent <br />Rock outcrops: 30 percent <br />Contrasting inclusions: 10 percent <br />CONTRASTING INCLUSIONS <br />Five percent Kech and Progresso soils on the hills and ridges in uplands. <br />Five percent Fluvents on the alluvial areas <br />~J <br />~J <br />• <br />Soils Description Report -West Elk Mine <br />December 7994 WESTEC 20 <br />