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• upper 2 to 3 feet. The fine-earth fraction of the soil materials varies <br />from loamy sand to silty clay loam. Slopes range from 5 to 55 percent and <br />are dominantly from 10 to 45 percent. Permeability is variable but is <br />expected to be mainly moderate or moderately rapid. Available water <br />capacity varies. Runoff is medium to very rapid and erosion hazard is <br />moderate to very high. The soils are dominantly non-saline or slightly <br />saline. The soil can support a wide range of native grasses, fortis, and <br />trees. This mapping unit is non-irrigated and used as rangeland and <br />wildlife habitat. <br />p 16 Casca.io very gravelly sandv loam. This deep, excessively drained <br />soil is found on the edges of stream terraces deeply dissected by <br />drainageways. It formed in gravelly and sandy alluvium. Typically, the <br />surface layer is very dark, grayish brown, very gravelly sandy loam about <br />6 inches thick. The upper 15" of the substratum is extremely cobbly sandy <br />loam. The lower part to a depth of 60+ inches is extremely cobbly sand. <br />• The soil has a high content of secondary calcium carbonate between depths <br />of 6 to 21 inches. The soil is moderately alkaline. Slope is 10 to 40 <br />percent. Permeability is moderately rapid to rapid. Available water <br />capacity is low. Runoff is rapid to very rapid. The danger of erosion <br />is high to very high. The potential plant community is grassland. The <br />major land uses is for rangeland. <br />p 19 Cathedral - Rock Outcrop complex. This unit contains about 75 <br />percent Cathedral soil and 15 percent Rock outcrop and is found on side <br />slopes and ridges. The Cathedral soil is a shallow, well drained soil <br />formed in colluvium and residuum derived dominantly from gneiss. A <br />typical section contains a top layer of about 6 inches of grayish brown, <br />very gravelly, coarse sandy loam, a 9-inch layer of dark grayish brown, <br />extremely gravelly sandy loam, and a 4-inch substratum of extremely <br />gravelly sandy loam. This overlays gneiss which starts at about 19 <br />inches. The soil is neutral to a depth of 15 inches and slightly acidic <br />below that depth. Slope is 45 to 65 percent. Permeability is rapid. <br />• Available water capacity is very low. Runoff is very rapid and the danger <br />of erosion is very high. Rock outcrops form short, narrow cliffs and low <br />knobs. They consist mostly of gneiss and have a slope of 50 to 80 <br />percent. The potential plant community is scattered pinyon and juniper <br />2.04.9-6 <br />