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r~•. <br />XTD -F ~/s3 <br />70--Ustic Torriorthents-Ustollic Haplargids complex, 12 to 60 percent <br />slopes. These deep, well drained and excessively drained soils are on <br />moderately steep [o steep terrace edges, mesa edges, and hillsides. They <br />formed in gravelly and cobbly alluvium. Elevation is 6,000 to 8,500 feet. <br />The average annual precipitation is about 14 to 19 inches. The average <br />annual air temperature is 45 [0 50 degrees F., and the average frost-free <br />season is 100 to 130 days. <br />This unit is 50 percent Ustic Torriorthents and 30 percent Ustollic <br />Haplargids. The Ustollic Haplargids are on the less sloping portions of the <br />map unit. Included in this unit is about 15 percent soils overlying bedrock <br />at depths of 40 inches or less and small areas of shale and sandstone <br />outcrops. <br />These soils vary considerably but generally, the Ustic Torriorthents <br />surface layers are gravelly or cobbly loam or fine sandy loam. The <br />substratums are very gravelly or cobbly ou[wash material. Generally, the <br />Ustollic Haplargids surface layers are gravelly or cobbly loam or fine sandy <br />loam. The subsoils are very cobbly or very gravelly 1o am, sandy clay Loam, <br />or fine sandy loam. The substratums are very gravelly or cobbly outwash <br />material. <br />Permeability of these soils vary depending on the texture of the parent <br />material. Effective rooting depth is 40 inches or more. Available water <br />capacity is low. Surface runoff is rapid, and hazard of water erosion is <br />high. <br />This mapping unit is used primarily for rangeland or wildlife habitat, <br /> <br />and for construction materials. <br />