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22a-Lymanson very fine sandy loam, 0 to 9 percent slopes. This <br />moderately deep well drained soil is on narrow elongate ridgetops. <br />It formed in residuum and from alluvium and colluvium derived from <br />interbedded shale and sandstone. Slopes are plane to slightly convex. <br />Areas are elongate in shape and are 1 to 20 acres in size. The <br />vegetation is mainly shrubs, fortis and grasses. Elevation ranges <br />from 7625 to 7725 feet. The average annual precipitation is about <br />IS inches and the mean annual air temperature is about 41°F. <br />Typically the surface layer is brown very fine sandy loam about <br />17 inches thick. The subsoil is yellowish brown sandy clay loam about <br />7 inches thick. The substratum is pale brown sandy loam about 10 inches <br />thick which is underlain by a paralithic contact of weathered sandstone <br />at a depth of 34 inches. <br />Included in mapping are about 10 percent Owen Creek shallow Variant <br />soils which occur in the more convex portions of the topography and <br />closer to the ridgetops. Also included are about 5 percent Splitro <br />soils and about 5 percent soils similar in all other respects to <br />Lymanson soils except that they are finer textured. <br />Permeability of this soil is moderate as is available water <br />capacity, Effective rooting depth is 34 inches. Surface runoff is <br />slow to medium and hazard of erosion by water is slight and by wind <br />is moderate. <br />This map unit is used for grazing, wildlife habitat and watezahed, <br />The soils of this mapping unit provide a good source of topsoil <br />to an average depth of 21 inches. <br /> <br />2-285 <br />