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• <br />CLASSIFICATION OF MAJOR COMPONENTS <br />Arvada loam, 1 to 6 percent slopes; Family Fine Montmorillonitic, <br />Mesic, Ustollic Natrargids. <br />INCLUSIONS <br />Included with this soil mapping unit are small areas of Limon, <br />Rim and Heldt soils all of similar slopes. Limon soils are Fine, <br />Montmorillonitic (calcareous), Mesic Ustic Torriorthents; Heldt <br />soils are Fine, Montmorillonitic, Mesic Ustertic Camborthids. <br />MAPPING UNIT 59BC - NIHILL CHANNERY LOAM <br />1 TO 6 PERCENT SLOPES <br />• This deep, well-drained, nearly level to sloping soil occurs on <br />alluvial fans and valley sideslopes between 5000 to 6500 feet <br />elevation. It formed in alluvium from Green River shale and sand- <br />stone. The average annual precipitation is about 13 inches, the <br />average annual air temperature is about 48 degrees F., and the <br />average frost-free period is about 125 days. <br />Typically, the surface of the Nihill soil is a light gray channery <br />loam about 4 inches thick. The upper subsoil is a very pale brown <br />channery loam 7 inches thick. The underlying material is a very <br />pale brown channery loam to stratified extremely channery sandy <br />loam and loam about 56 inches thick. Reaction is mildly to strongly <br />alkaline throughout the profile. The surface has a channery cover <br />of 20 to 50 percent. Most coarse fragments in the underlying <br />material have thin coatings of calcium carbonate on the undersides <br />and are fragments of sandstone less than 3 inches in length and <br />1/2 to 1-1/2 inches thick; they make up more than 35 percent of <br />. the total soil. <br />I-13 <br />