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Typically, the surface horizon is not as fine as that of the typic pedon having <br />about 4 inches of loam followed by about 10 inches of a silty clay loam. In this <br />• <br />mapping unit the argillic horizon occurs at about 14 inches. Cracking and carbonate <br />accumulation occur much like that described for the series. <br />Presently, some portions of this soil are used for dryland wheat, oats and barley <br />production, while those found on steep upland slopes and above draws are used for <br />rangeland. <br />Permeability is moderately slow to moderate. Erosion is a hazard if the soil is <br />left without adequate vegetative cover. The depth to ground water is greater than <br />5 feet. Effective rooting depth is about 30 inches. Stoniness class is 2. <br />Land capability class is Vle. <br />MAP UNIT BiD: BINCO SILTY LOAM, 15 TO 30 PERCENT SLOPE <br />This deep, well-drained, and fine textured soil is found on strongly sloping to <br />moderately steep toe-slopes and side-slopes of ridges and draws. This soil occurs in <br />weathered material from Lewis shale. This mapping unit occurs on toe-slopes north <br />of Middle Creek, southwest I/q southwest I/q Section 13, T.SN R.86W, at 6,700 to <br />~r 7,100 feet elevation. <br />Typically, this mapping unit differs from the series description by having a <br />gravelly silty clay loam surface horizon of about 7 inches overlying a heavy argillic. <br />The subsoil is a grayish brown silty clay and extends to depths greater than 36 inches. <br />Included in this mapping unit are small areas of Aaberg silty clay. Inclusions <br />make up about 10 percent of the map unit. <br />Presently this soil is used exclusively for rangeland. Due to the steepness of <br />grade, vegetation is sparce, productivity low, and barren areas are frequent. <br />Artemisia tridentata big sage and grasses are dominant. <br />Permeability is moderately slow to moderate. Erosion is high; many areas of <br />steeper slopes hove eroded and are barren. Depth to ground water is greater than <br />5 feet. Effective rooting depth is about 40 inches. Stoniness class is 3. <br />Land capability unit is Vlle. <br />MAP UNIT BuB: BUCKSKIN LOAM, 2 TO 8 PERCENT SLOPE <br />This deep, well-drained, and fine textured soil occurs on gently to moderately <br />sloping ridges and mid-slopes. This soil is formed in alluvium and residuum derived <br />2.3-3 <br />