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Mapping Unit X10 <br />• Abor-Moyerson silty clay loam complex <br />These shallow and moderately deep, well-drained soils are on moderately <br />steep hillsides. The only tract of this complex encountered on the <br />permit area is found on the south end of Lease tract 20900 at Mine 2. <br />Native vegetation is largely sagebrush. The Abor (4) soil makes up <br />about 55 percent and the Moyerson soil makes up about 35 percent of this <br />complex. Small areas of Bulkley silty clay loam (l0E) are included in <br />this unit. Also included are small areas with stones on the surface. <br />Typically the Abor soil has a brown silty clay loam surface layer about <br />10 inches thick. The subsoil is pale brown silty clay loam about 10 <br />inches thick. The substratum is pale brown silty clay about 8 inches <br />thick and overlies partially weathered shale at a depth of 28 inches. <br />Permeability of the Abor soil is very slow. Available water capacity is <br />low. Effective rooting depth is 20 to 40 inches. Surface runoff is <br />rapid and erosion hazard is high from water. <br />Typically the Moyerson soil has a light brownish gray silty clay loam <br />surface layer about 2 inches thick. The lower part of the surface layer <br />is light brownish gray silty clay loam about 2 inches thick. The under- <br />lying material is highly weathered shale material about 9 inches thick <br />and overlies shale at a depth of 13 inches. <br /> <br />-25- <br />