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t <br /> <br />llb--Evanston shallow Variant sandy clay loam, 10 to 29 percent slopes. <br />This moderately deep well drained soil is on upland bedrock-controlled <br />benches and sideslopes. It formed in residuum and from alluvium and <br />colluvium derived from sandstone. Slopes are plane. Areas are <br />irregular in shape and are 1 to 58 acres in size. The vegetation <br />is mainly shrubs, forbs and grasses. Elevation ranges from 6625 to <br />7200 feet. The average annual precipitation is about 14 inches and <br />the average annual air temperature is about 42°F. <br />Typically the surface horizon is brown clay sandy loam about 2 <br />inches thick. The subsoil is light yellowish brown clay loam about <br />6 inches thick. The substratum is very pale brown clay loam about <br />16 inches thick which is underlain by a paralithic contact of soft <br />. calcareous sandstone at a depth of 24 inches. The soil is calcareous <br />throughout the profile. <br />Included in mapping is about 10 percent Savage, about 5 percent <br />Hesperus shallow Variant and about 5 percent soils similar to Evanston <br />shallow Variant except that they have lighter colors and less organic <br />matter in the surface soil to a depth of 7 inches. <br />Permeability of this Evanston shallow Variant is moderate to <br />moderately slow. Available water capacity is moderate. Effective <br />rooting depth is 24 inches. Runoff is medium and hazard of erosion <br />by wind is slight and by water is slight to moderate. <br />This map unit is used for rangeland and wildlife habitat. <br />The soils of this map unit provide a fair to good source of topsoil <br /> <br />2-265 <br />