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lz~~b <br />78--Pinon-Ustic Torriorthents complex, 5 to 30 percent slopes. <br />fh~s map unit is on upland hills and ridges. The native vegetation is <br />mainly pinyon pine, Utah juniper, and grasses. Elevation is 5,500 to <br />6,800 feet. The average annual precipitation is 12 to 14 inches, the <br />average annual air temperature is 46 to 48 degrees F, and the average <br />frost-free period Is 110 to 130 days. <br />This unit is 50 percent Pinon loam and 35 percent Ustic <br />forriorthents. The components of this unit are so intricately <br />intermingled that it was not practical to map them separately at the <br />scale used. <br />Included in this unit is about 5 percent Barx soils, 5 percent <br />9owdish soils, and 5 percent Rock outcrop. <br />The Pinon soil is shallow and well drained. It formed in residuum <br />derived dominantly from sandstone and shale. Typically, the surface <br />layer is brown loam about 5 inches thick. The underlying material to <br />a depth of 16 inches is pinkish white loam. Hard sandstone is at a <br />depth of 16 inches. In some areas the surface layer is gravelly loam, <br />cobbly loam, sandy loam, or gravelly sandy loam. <br />Permeability of the Pinon soil is moderate. Available water <br />r.:apacity is very low. Effective rooting depth is 10 to 20 inches. <br />Runoff is rapid, and the hazard of water erosion is moderate to very <br />high. <br />3v3 <br />