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percent of this complex and occupy small colluvial fans, toeslopes, <br />and areas of weathered shale. The Rock Outcrop part makes up about <br />40 percent of this complex and occupies vertical ledges, ridgetops <br />and steeper sideslopes. Included with this complex in mapping are <br />a few small areas of exposed shale ledges, with Rock river and <br />Yamac soils in toeslope.positions which make up the other 10 <br />percent. <br />The Torriorthents part consists of shallow to moderately deep, <br />coarse to medium textured, stoney and cobbly, well drained soils <br />over sandstone and shale at depths of 10 to 40 inches. These soils <br />have light colored surface and substratum layers, with moderate to <br />rapid permeability, low available water capacity, a moderate wind <br />erosion hazard, and a high water erosion hazard. <br />The Rock Outcrop part is predominantly sandstone in long narrow <br />bands with colluvial stones, cobbles and boulders at the base. <br />Most of this complex is in native range and has limited use for <br />grazing. Present and potential productivity is poor. <br />104 - Borolls-Rock Outcrop Complex <br />This moderately steep to very steep complex is on north and west <br />valley sideslopes and ridges. The soil occurs throughout the <br />permit area. In the areas where rock outcrop do not occur, the <br />• solids have a good potential for reclamation. The average annual <br />precipitation ranges from 15 to 18 inches, the average annual soil <br />temperature is 42°F to 47°F, and the frost-free season is 75 to 95 <br />days. The Borolls make up about 50 percent of this complex and <br />occupy lesser slopes. The Sandstone Rock outcrop part makes up <br />about 30 percent of this complex and occupies steeper slopes and <br />ridgetops. Included with this complex in mapping are a few small <br />areas of shale outcrops and shallow shale soils which make up the <br />other 20 percent. <br />The Borolls are shallow to deep, medium to fine textured, well <br />drained soils over interbedded sandstone and shale at a depth of 10 <br />to 60 inches. They may be cobble or stone filled. <br />Typically the surface layer is dark grayish brown sandy loam or <br />loam from 8 to 20 inches thick. The subsoil, where present, is <br />grayish brown sandy clay loam, or clay from 10 to 20 inches thick. <br />The substratum is light brownish gray sandy loam or sandy clay <br />loam. Soft interbedded sandstone and shale are at depths ranging <br />from 10 to more than 60 inches. <br />The Boroll portion has moderate to rapid permeability and the <br />available water capacity ranges from low to high. The effective <br />rooting depth is from 10 to 60 inches or more. Surface runoff is <br />medium, and erosion hazard is slight to moderate from wind and high <br />from water. <br />2.04.9-8 <br />