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I • The Rock outcrop drainage class and slowest permeability aze both unspecified. Available water holding capacity is very low. Depth to restrictive feature is 0 inches to bedrock Run off class is very high. The Torriorthents soil is well drained. It is formed in colluvium and residuum derived from sandstone and shale. Available water holding capacity is very low and the slowest permeability is moderate. Effective rooting depth is 4 to 30 inches to bedrock. Runoff is very high. Typically, the Torriorthents soil surface layer is channery sandy loam 2 inches thick. The upper part of the subsoil is channery sandy loam to clay loam 12 inches thick. The lower part to a depth of 1 S inches is unweathered bedrock 162 -Rock River sandy loam, 3-12% slopes The Rock River series consists of very deep, well-drained soils that are found on benches, alluvial fans and hillslopes. Rock River soils are formed in eolian deposits and residuum derived from sandstone. Elevation is 6,200 to 7,200 feet. The average annual precipitation is 11 to 13 inches, the average annual air temperature is 42 to 45 degrees F., and th~ average frost-free period is 75 to 95 days. Typically, the upper 3 inches of the surface layer is light browni~h gray sandy loam. The lower 19 inches is yellowish brown sandy clay loam. The upper 10 inches of the subsoil is yellowish brown sandy clay loam. The lower part to a depth of 60 or more inches is light brownish gray loamy sand. • Included in this unit are a few small areas of Berlake and Forelle soils. Permeability of this Rock River soil is moderate. Available water holding capacity is moderate. Effective rooting depth is 60 inches or more. Runoff is moderate, and the hazard of water erosion is moderately low. The hazard of soil blowing is low. This unit is used for rangeland and wildlife habitat. 163 -Rock River sandy loam, 12 - 25% slopes This very deep, well drained soil is on hill sides. It formed in residuum derived from sandstone. Elevation is 6,200 to 7,300 feet. The average annual precipitation is 1 ] to 13 inches, the average annual air temperature is 42 to 45 degrees F., and the average frost-free period is 75 to 95 days. Typically the surface layer is dark yellowish brown sandy loam 3 inches thick. The upper 19 inches of the subsoil is brown, light brown, and yellowish brown sandy clam loam. The next part to a depth of 32 inches is light yellowish brown calcareous sandy clay loam. The lower part to a depth of 60 inches or more is very pale brown calcareous sandy loam. Included in this unit are small areas of Forelle soils and Beriake soils Permeability of this Rock River soil is moderate. Available water holding capacity is moderate. Effective rooting depth is 60 inches or more. Runoff is rapid, and the hazard of water erosion is • high. The hazard of soil blowing is moderate. This unit is used for homesite development, livestock grazing, and wildlife habitat.