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Mapping Unit X4F <br />• Aaberg-Waybe silty clay loams complex <br />These shallow and moderately deep, well-drained soils are on sideslopes <br />and ridge crests. They formed in material weathered from shale and <br />siltstone. The only known tract of this complex is found to the east of <br />Pinnacle Peak. Sagebrush is the predominate native vegetation type en- <br />countered. The Aaberg (35) soil makes up about 50 percent and the Waybe <br />(14) soil makes up about 40 percent of this complex. Small areas of <br />Binco silty clay loam (C10) with stones on the surface and rock outcrop <br />are included in this unit. <br />Typically the Aaberg soil has a grayish brown silty clay surface layer <br />• about 2 inches thick. The subsoil is pale brown silty clay about 30 <br />inches thick. The substratum is light yellowish brown silty clay about <br />3 inches thick and overlies soft shale bedrock at a depth of 35 inches. <br />Permeability of the Aaberg soil is very slow. Available water capacity <br />is low. Effective rooting depth is 20 to 40 inches. Surface runoff is <br />rapid and erosion hazard is high from water. <br />Typically the Waybe soil has a light brownish gray silty clay loam <br />surface layer about 4 inches thick. The lower part of the surface layer <br />is light brownish gray silty clay loam about 3 inches thick. The <br />underlying material is highly weathered shale material about 10 inches <br />thick and overlies partially weathered shale at a depth of 17 inches. <br />• <br />-20- <br />