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X4E--Aaberg-Maybe complex, 12 to 25 percent slopes. This map unit is on hillsides and ridge crests. Elevation is 6,800 to 8,400 feet. The average annual precipitation is about 17 to 20 inches, the average annual air temp- erature is about 37 to 40 degrees F, and the frost-free season is 40 to 65 days. This unit is 50 percent Aaberg soil and 40 percent Waybe soil. Included in this unit are small areas of Binco silty clay loam, areas with stones on the surface, and rock outcrop. The Aaberg soil is moderabely deep and well drained. It formed in residuum and alluvium derived from shale. Typically, the surface layer is grayish brown silty clay about 2 inches thick. The subsoil is pale brown silty clay about 30 inches thick. The substratum is light yellowish brown silty clay about 3 inches thick and overlies soft whale bedrock at a depth of 35 inches. • Permeability of the Aaberg soil is very slow. Available water capacity is low. Effective rooting depth is 20 to 40 inches. Runoff is rapid, and the hazard of water erosion is high. The Waybe soil is shallow and well drained. It formed in residuum derived from shale. Typically, the surface layer is light brownish gray silty clay loam about 4 inches thick. The lower part of the surface layer is light brownish gray silty clay loam about 3 inches thick. The underlying material is highly weathered shale material about 10 inches thick and overlies partially weathered shale at a depth of 17 inches. Permeability of the Waybe soil is slow. Available water capacity is very low. Effective rooting depth is 5 to 20 inches. Runoff is rapid, and the hazard of water erosion is high. This unit is used for livestock grazing and wildlife habitat. The potential plant community on the Aaberg soil is mainly mountain big sagebrush, • western wheatgrass, lettermans needlegrass and slender wheatgrass. Other plants that characterize this site are bottlebrush squirreltail, mulesears Ex. 16-11