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Mapping Unit 99 <br />• Cryoborolls-Rock outcrop <br />This moderately steep to very steep complex is on valley sideslopes and <br />ridges. The Cryoborolls make up about 50 percent of this complex and <br />occupy lesser slopes. The sandstone Rock outcrop part makes up about 30 <br />percent of this complex and occupies steeper slopes and ridge tops. In- <br />cluded with this complex in mapping are small areas of shale outcrops <br />and shallow shale soils which make up the other 20 percent. <br />The Cryoborolls are shallow to deep, medium to fine textured well- <br />drained soils over interbedded sandstone and shale at depths of 10 to 60 <br />inches. These soils may be cobble or stone-filled. <br />• Typically the surface layer is dark grayish brown sandy loam or loam <br />from 8 to 20 inches thick. The subsoil, where present, is grayish brown <br />sandy clay loam, clay loam, or clay from 10 to 20 inches thick. The <br />substratum is light brownish gray sandy loam or sandy clay loam. Soft <br />interbedded sandstone and shale are at depths ranging from 10 to greater <br />than 60 inches. <br />The Cryoboroll portion has moderate to rapid permeability and the available <br />water capacity ranges from low to high. The effective rooting depth is <br />from 10 to 60 inches or more. Surface runoff is medium and erosion <br />hazard is slight to moderate from wind and high from water. <br /> <br />-15- <br />