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• Bruniums, and Gray Wooded softs in the 1938 classification. <br />Within the mine area, the Routt Loam and the Skylick Loam belong to the Paleboroll great group. <br />Cdr is Paleborolls <br />These soils have a cryic soil [empera[ure regime bu[ are otherwise like Typic Paleborolls in their refined <br />properties. These soils are the most extensive of the subgroups of Paleborolls, but they are not <br />extensive in [he United Stales. They are on moderately sloping or steep mountain slopes in Utah, <br />Idaho, Mon[ana and Colorado at elevations above 1,500 m and are used mostly for summer grazing. <br />The Rou[[ soil series belongs to the Cryic Paleboroll subgroup. <br />Pachic Paleboroll <br />These soils have a thicker mollic epipedon than Typic Paleborolls. They are permitted but are not <br />required to have mottles and to have shallow ground water at some time during the year. These soils <br />occur at elevations above 1,500 m in mountain areas on very sleep north or northeut slopes. They are <br />rare, and [hey are used mostly for summer grazing (1). <br />The Skylick Loam belongs to the Pachic Paleboroll subgroup. <br />• C~oborolls <br />These are the cold Borolls. Summers are cool and short. Most of the cryoborllls in the United States <br />stales are found in [he mountains of the western states. In addition to [he mollic epipedon, a variety <br />of other horizons are present. Cambic, argillic, and caldc horizotu are common; a natric horizon, a <br />duripan, or an albic horizon is present in a few soils. These horizons are used to define the subgroups. <br />Many of [here soils tlut do not have a calcic horizon have a a horizon below the ambit or the <br />azgillic horizon. <br />The Cryoborolls were formed mainly in late Pleistocene or Holocene deposits or on svrfaas of <br />equivalent ages. <br />The Cryoborolls were mostly included with Chernoums and Bruniums in [he 1938 rlassifiation <br />as modified in 1952. Beauu thcy are very cold and commonly are inaccessible, they have received <br />relatively little attention in the United States (1). <br />The Lymanson, Splitro, and Winevada soft series belong to the grew[ group Cryoborolls. <br />Areic Cryoborolls <br />Soils in this subgroup have an argillic horizon but otherwiu are like Typic Cryoborolls. Slopes of <br />these soils in [he United States range from gentle to strong. Some of the soils support a coniferous <br />forest, some have a cover of grass, others have upen trees, and still others have miztures of these <br />plane. These soils are moderately extensive in the high mountains of the western states (1). <br />57 <br />