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t. <br />35b-Abor clay loam, IO to 29 percent slopes. This moderately deep <br />well drained soil is on hilly uplands. It formed in residuum from <br />shale. Slopes are plane to slightly concave. Areas are irregular <br />in shape and are 2 to I6 acres in size. The vegetation is mainly <br />grasses, (orbs and scattered shrubs. Elevation ranges from 7025 to <br />7600 feet. The average annual precipitation is about 15 inches and <br />the mean annual air temperature is about 41°F. <br />Typically the surface layer is light brownish gray clay loam about <br />two inches thick. The subsoil is grayish brown clay about 30 inches <br />thick. The substratum is light brownish gray clay about 8 inches thick <br />which is underlain at a depth of 40 inches by a paralithic contact <br />. of shale. The soil is calcareous below 32 inches. <br />Included in this unit is about 10 percent Cochetopa and about <br />5 percent Rhone soils. <br />Permeability of the Abor soil is moderately slow to slow. The <br />available water capacity is low. Effective rooting depth is 40 inches. <br />Surface runoff is medium to rapid and hazard of erosion by water is <br />moderate to severe. Wind erosion hazard is slight. <br />This map unit is used for grazing. <br />The soils of this mapping unit provide a fair to poor source of <br />topsoil to an average depth of 2 inches. However no topsoil stripping <br />is recommended due to the shallow nature of the acceptable medium. <br />Clayey textures and high saturation percentage values below this depth <br />make the lower horizons unsuitable as a topdressing material, <br /> <br />2-313 <br />