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1 <br />26b-Rentsac moderately deep Variant very fine sandy loam, 10 to 29 <br />percent slopes. This moderately deep well drained soil occurs on <br />sideslopes of ridges. It formed in residuum and from alluvium and <br />colluvium weathered from sandstone. Slopes are plane to slightly <br />convex. Areas are irregular in shape and are 1 to 5 acres in size. <br />The vegetation is a sparse cover of shrubs, forbs and grasses. Elevation <br />ranges from 6400 to 6900 feet. The average annual precipitation in <br />about 14 inches and the mean annual air temperature is about 42°F. <br />Typically the surface is Light yellowish brown very fine sandy <br />loam about 3 inches thick. The substratum is light yellowish brown <br />and pale brown fine sandy loam about 25 inches thick. A paralithic <br />contact of weathered sandstone occurs at 28 inches. The soil is <br />calcareous throughout the profile. <br />Included in mapping this unit is about 5 percent Busby Variant <br />and about 5 percent each Rentsac Variant and Rentsac deep Variant. <br />Also included is about 5 percent soils similar in all other respects <br />to Rentsac moderately deep Variant except that they are finer textured. <br />Permeability of this soil is moderate as is available water <br />capacity. Effective rooting depth is 28 inches. Runoff is medium <br />and hazard of erosion by wind is moderate and by water slight. <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 9 inches. The structureless infertile substratum <br />horizon below this depth is not suited as a topdressing medium. <br /> <br />2-298 <br />