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19a--Rhone sandy clay loam, 0 to 9 percent slopes. This very deep, <br />well drained soil is in slightly incised drainage positions on upland <br />sides lopes. It formed in colluvium derived from sandstone. Slopes are <br />plane to slightly concave. Areas are irregular in shape and are 1 to 10 <br />acres in size. The vegetation is mainly shrubs, forbs and grasses. <br />Elevation ranges from 7,160 to 7,570 feet. The average annual precipi- <br />tation is about 15 inches and the mean annual air temperature is about <br />41°F. <br />Typically the surface layer is dark grayish brown sandy clay loam <br />about 7 inches thick. The subsoil is very dark grayish brown and dark <br />brown sandy clay loam about 29 inches thick. The substratum is dark <br />brown sandy clay loam extending to a depth of greater than 60 inches. <br />Included in mapping are about 10 percent soils similar in all other <br />respects to Rhone except that they have fine control section textures. <br />Also included are about 5 percent Cochetopa soils and small areas of <br />soils similar to Rhone except that they are less than 40 inches deep. <br />Permeability of the Rhone soil is moderate as is available water <br />capacity. Effective rooting depth Ls greater than 60 inches. Runoff is <br />medium and hazard of erosion by both water and wind is slight. <br />This map unit is used for grazing. <br />The soils of this mapping unit provide a good source of topsoil to <br />an average depth of 36 inches. Firm moist consistencies and clayey tex- <br />tares in subsurface layers are the major limiting factors. <br />., <br />2-280 <br />