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<br /> <br />7/86 <br />X48--Tellura-Leaps ccmplex, 5 to 40 percent slopes. This map unit <br />is on alluvial fans, mountain side slopes, and benches. The native <br />vegetation is mainly grasses, shrubs, and forbs. Elevation is 8,500 to <br />10,500 feet. The average anrnaal precipitation is 22 to 25 inches, the <br />average annual air temperature is 35 to 40 degrees F, and the average <br />frost-free period is 40 to 70 days. <br />This unit is 45 percent Tellura clay loam and 40 percent Leaps loam. <br />Included in this unit is about 5 percent soils similar to these Tellura <br />and Leaps soils but havirg less than 35 percent clay in the control section, <br />and 5 percent Cryoborolls, moderately deep soils. Also included are shall <br />areas of s h31e outcrops and Hofly soils. <br />The Tellura soil is deep and well drained. It formed in thick very <br />gravelly and cobbly noncalcareous glacial drift, colluvium, or slope wash <br />derived dominantly from mixed sedimentary and igneous rock. Typically, the <br />surface layer is dark gray clay loam 14 inches thick. The subsoil is <br />yellowish brown very gravelly clay 16 inches thick. The next layer is <br />yellowish brawn very cobbly clay 6 inches thick. The substratum to a depth <br />of 60 inches or more is brown very cobbly clay loam. In some areas the <br />surface layer is loam, cobbly loam, or gravelly loam. <br />Permeability of the Tellura soil is slow. Available water capacity is <br />moderate. Effective rooting depth is 60 inches or more. Runoff is median <br />to very rapid, and the hazard of water erosion is moderate to very high. <br />