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~~~ 31b--Cushool Variant loam, 10 to 29 percent slopes. This moderately <br />/f deep well drained soil is on rolling uplands. It formed in residuum <br />from material weathered from sandstone. Slopes are plane to slightly <br />concave. Areas are irregular in shape and are 7 to 15 acres in size. <br />The vegetation is mainly shrubs and fortis. Elevation ranges from 6740 <br />to 6900 feet. The mean annual precipitation is about 14 inches and the <br />average annual air temperature is about 42° F. <br />Typically, the surface is brown loam about two inches thick. The <br />subsoil is yellowish brown clay loam about 13 inches thick. The subsoil <br />is yellowish brown clay about 6 inches thick. A paralithic contact <br />of calcareous sandstone occurs at 21 inches. <br />Included in mapping are about 10 percent Forelle soils, 5 percent <br />Evanston shallow Variant and about 5 percent soils similar in all other <br />respects to Cushool Variant except that they are coarser textured. <br />Permeability of this Cushool Variant soil is moderate. Available <br />water capacity is low to moderate. Effective rooting depth is 21 inches. <br />Runoff is medium and hazard of erosion by water is slight. The hazard <br />of wind erosion is slight to moderate. <br />This map unit is used fcr grazing. <br />The soils of this map unit provide a good to fair source of topsoil <br />to an average depth of 15 inches. Below this depth clayey textures <br />make the soils unacceptable for use as topdressing material. <br />I_~ <br />2-311 <br />