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/- /.. <br />1L"11 Horsethief, stony fine sandy ]nam, 20 to 65 percent slopes <br />This deep, well drained soil is on steep cues[as, hoghacks, and <br />mountainsides. It formed in stony colluvial material composed mostly <br />of sandstone and shale. Elevation is 8,000 to 10,000 feet. The average <br />annual precipitation is 18 to 30 inches. The average annual air tempera- <br />~ ., <br />ture is ~ to ~ degrees. The average frost-free season is 60 to}E3'days. <br />Typically, [he surface is covered by a two inch layer of undecomposed <br />leaves, needles and twigs. The surface layer is typically grayish brown <br />~~~^Y stony fine sandy loam about 2 inches thick. The lower part of the surface <br />is a very pale brown and light gray stony fine sandy loam about 22 inches <br />thick, The upper part of the subsoil is a~~a~e~-r~wa and light gray ex- <br />tremely stony clay loam about 8 inches thick. The lower part of the subsoil <br />is a brownish yellow and pale brown extremely stony clay loam ahout 10 inches <br />thick, The substratum is^pa~e-warn very stony clay loam about 8 inches <br />thick. This is underlain by shale and sandstone at depths ranging from 40 <br />to 60 inches or more. <br />Included with this unit is about 20 percent Nordic stony tine sandy <br />loam, 15, percent Uinta loam, and minor amounts of Valto and rock outcrop. <br />Permeability is moderately slow. Effective rooting depth is 40 to <br />60 inches or more. Available water capacity is low. Surface runoff is <br />we$aate and erosion hazard is moderate. <br />The soil is used mostly for wildlife habitat. The less sloping <br />areas are also used for timber production and livestock grazing. <br />The less sloping areas of this unit are suited to the production of <br />White fir. Based on a site index of ^, the potential production of mer- <br />chantable timber is cubic feet or board feet per acre <br />