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percent of this complex and occupy small colluvial fans, toeslopes, and areas of weathered shale. The Rock outcrop part makes up about 40 percent of this complex and occupies vertical ledges, ridgetops and steeper sideslopes. Included with this complex in mapping are a few small- areas of exposed shale ledges, with Rock river and Yamac soils in toeslope positions which make -up the other 10 percent. The Torriorthents part consists of shallow to moderately deep, coarse to medium textured, stoney and cobbly, well drained soils over sandstone and shale at depths of 10 to 40 inches. These soils have light colored surface and substratum layers, with moderate to rapid permeability, low available water capacity, a moderate wind erosion hazard, and a high water erosion hazard. The Rock outcrop part is predominantly sandstone in long narrow bands with colluvial stones, cobbles and boulders at the base. Most of this complex is in native range and has limited use for grazing. Present and potential productivity is poor. 104 -Borolls-Rock Outcrop Complex This moderately steep to very steep complex is on north and west valley sideslopes and ridges. The soil occurs throughout the permit area. [n the areas where rock outcrop do not occur, the solids have a good potential for reclamation. The average annual precipitation ranges from IS to 18 inches, the average annual soil temperature is 42°F to 47°F, and the frost-free season is 75 to 95 days. The Borolls make up about 50 percent of this complex and occupy lesser slopes. The Sandstone Rock outcrop part makes up about 30 percent of this complex and occupies steeper slopes and ridgetops. Included with this complex in mapping are a few small areas of shale outcrops and shallow shale soils which make up the other 20 percent. The Borolls are shallow to deep, medium to fine textured, well drained soils over interbedded sandstone and shale at a depth of 10 to 60 inches. They may be cobble or stone filled. Typically the surface layer is dark grayish brown sandy loam or loam from 8 to 20 inches thick. The subsoil, where present, is grayish brown sandy clay loam, or clay from 10 to 20 inches thick. The substratum is light brownish gray sandy loam or sandy clay loam. Sofr interbedded sandstone and shale are at depths ranging from 10 to more than 60 inches. The Boroll portion has moderate to rapid permeability and the available water capacity ranges from low to high. The effective rooting depth is from 10 to 60 inches or more. Surface runoff is medium, and erosion hazard is slight to moderate from wind and high from water. 2.04.9-8