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t <br />ISb--Cochetopa loam, 10 to 29 percent slopes. This deep well drained <br />soil is on hilly uplands. It formed in alluvium and colluvium derived <br />from sandstone and shale. Slopes are plane to slightly convex. Areas <br />are irregular in shape and are 5 to 930 acres in size. The vegetation <br />is mainly shrubs, forbs and grasses. Elevation ranges from 6900 to <br />7660 feet. .The average annual precipitation is about 16 inches and <br />the mean annual air temperature is about 41°F. <br />Typically the surface is dark grayish brown and grayish brown <br />loam and clay loam about 21 inches Chick. The subsoil is brown and <br />dark yellowish brown clay loam about 19 inches thick. The substratum <br />is light yellowish brown sandy clay loam extending to a depth of greater <br />. than 60 inches. <br />Included in mapping is about 10 percent Skylick soils which occurs <br />in the more convex portions of the topography and about 10 percent <br />Rhone soils. <br />Permeability of this Cochetopa soil is moderate to slow. Available <br />water capacity is moderate to low. Effective rooting depth is 40 <br />inches. Runoff is medium and hazard of wind erosion is slight. The hazard <br />of water erosion is moderate. <br />This map unit is used for grazing. <br />The soils of this map unit provide a good to fair source of topsoil <br />to an average depth of 27 inches. Clayey textures and firm moist <br />consistencies in subsurface horizons are the major limiting factors. <br />Below this depth the soil textures become too clayey to be acceptable <br />,~ as topdressing medium. <br />2-278 <br />