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t <br />25b--Rentsac Variant fine sandy loam, 10 to 29 percent slopes. This <br />shallow somewhat excessively drained soil occurs on ridgetops and south <br />and southwesterly-facing sideslopes. It formed in residuum and from <br />colluvium derived from sandstone. Slopes are plane to convex. Areas <br />are irregular in shape and are 1 to 50 acres in size. The vegetation <br />is a sparse cover of shrubs, forbs and grasses. Elevation ranges from <br />6375 to 6900 feet. The average annual precipitation in about 14 inches <br />and the mean annual air temperature is about 45'F. <br />Typically the surface is light yellowish brown fine sandy loam <br />about 3 inches thick. The substratum is light yellowish brown sandy <br />clay loam about 15 inches thick. A paralithic contact of weathered <br />sandstone occurs at 18 inches. The soil is calcareous throughout the <br />prof ile. <br />Included in mapping this unit is about 5 percenC Busby Variant <br />about 5 percent each Rentsac moderately deep Variant and Rentsac deep <br />Variant. Also included is about 5 percent soils similar in all other <br />respects to Rentsac Variant except that they are finer textured. <br />Permeability of this soil is moderate and available water capacity <br />is low to moderate. Effective rooting depth is 18 inches. Runoff <br />is medium and the hazard of water erosion is slight. The hazard of wind <br />erosion is moderate. <br />This unit is used for wildlife and watershed. <br />The soils of this unit provide a good source of topsoil to an <br />average depth of g inches. The structureless infertile substratum <br />horizon below this depth is unsuitable for topsoiling purposes. <br />2-295 <br />