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t <br />41a--Aridic Haploborolls coar~-loamv,i~xed_ 0 to 9 percent slopes. <br />This deep well drained soil is in upland basins, valley sideslopes, <br />and gently rolling uplands. It formed from alluvium and colluvium <br />derived from sandstone. Slopes are concave. Areas are elongate in <br />shape and are 2 to 28 acres in size. The vegetation is mainly shrubs, <br />fortis and grasses. Elevation ranges from 6400 to 6700 feet. The average <br />annual precipitation is about 14 inches and the mean annual air <br />temperature is about 41°F. <br />Typically the surface layer is brown very fine sandy loam about <br /> <br />20 inches [hick. The substratum is brown fine sandy loam extending <br />to a depth of greater than 60 inches. The soil is calcareous below <br />a depth of 36 inches. <br />Included in this mapping unit is about 10 percent Coberly Variant, <br />about 5 percent Savage and about 5 percent Grail Taxadjunct soils. <br />Permeability of this Aridic Haploboroll soil is moderate. <br />Available water capacity is moderate. Effective rooting depth is <br />greater than 60 inches. Runoff is medium and hazard of erosion by <br />water is slight and moderate by wind. <br />This unit is used for grazing, wildlife, and watershed. <br />The soils of this unit provide a good source of topsoil to an <br />u <br />average depth of greater than 20 inches. The atructureless, infertile <br />substratum horizons below this depth are unsuited for the purpose of <br />topsoiling. <br />2-318 <br />