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n <br />S <br />106 - Prieta Variant - Rock Outcrop complex, 10 to 40 percent <br />slopes. <br />This map unit is on steep sideslopes. It is comprised <br />of about 50 percent Prieta Variant soils and 35 percent Rock <br />Outcrop. The Prieta Variant soil is shallow, clayey, and <br />well-drained. It developed from pockets of loess, colluvial <br />and alluvial derived from sandstone and shale. Small areas <br />of shallow loamy-skeletal and loamy Torriorthents were <br />included in mapping. Torriorthents soils are less developed. <br />These soils occupy less than 15 percent of the mapping unit. <br />In a typical profile, the surface layer is light brownish <br />gray channery loam about 2 inches thick. The upper subsoil <br />• is grayish brown very channery clay loam bout 6 inches thick. <br />The lower subsoil is grayish brown very channery clay about <br />6 inches thick and is underlain with shale at a depth of <br />14 inches. <br />The Prieta Variant soil has moderately slow permeability <br />and medium runoff. The erosion hazard is moderate. Available <br />water holding capacity is low. Effective rooting depth is <br />10 to 20 inches. <br />This soil is used for livestock grazing and wildlife <br />habitat. The vegetation is primarily blue grama, galleta, <br />western wheatgrass with scattered pinyon-juniper. <br /> <br />