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lOle--Torriorthents-Rock outcrop complex, steep. This map unit is <br />on upland sides lopes. Slopes are plane to slightly convex. Areas are <br />irregular in shape and are 1 to 65 acres in size. The vegetation is <br />mainly shrubs, fortis and grasses. Elevation ranges from 7,000 to 7,500 <br />feet. The average annual precipitation is about 14 inches and the mean <br />annual air temperature is about 42°F. <br />This complex is about 50 percent Torriorthents and about 35 percent <br />Rock outcrop. The Rock outcrop occurs mainly as exposed bedding planes <br />throughout the map unit. <br />The Torriorthents map unit consists of shallow to deep, somewhat <br />excessively to well drained soils. They formed in residum and <br />colluvium derived from thinly interbedded layers of sandstone and shale. <br />The surface of the Torriorthen[ soil described is brown very gravelly <br />sandy loam about 10 inches thick. The substratum is pale brown <br />extremely gravelly clay loam about 7 inches thick. A paralithic contact <br />of highly weathered shale occurs at a depth of 17 inches. <br />Permeability of this soil is moderate. Available water capacity is <br />low. Effective rooting depth is 17 inches. Runoff is rapid and hazard <br />of erosion by both water and wind is moderate. <br />This unit is used for wildlife habitat and watershed. <br />The soils of this map unit provides a poor to unusable source of <br />topsoil to an average depth of 10 inches. High content of coarse frag- <br />men u, many rock outcrops throughout the unit and steep slopes are the <br />main limitations. <br /> <br />2-327 <br />