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• 2.04.9 <br />^ RESPONSE continued <br />The Cryoborolls were mostly included with Chernozems and <br />Brunizems in the 1938 classification as modified in 1952. Because <br />they are very cold and commonly are inaccessible, they have <br />received relatively little attention in the United States (1). <br />The Lymanson soil series belongs to the subgroup Argic Cryo- <br />borolls. <br />Argic Cryoborolls <br />Soils in this subgroup have an argillic horizon but otherwise are - _ <br />like Typic Cryoborolls. Slopes of these soils in the United <br />States range from gentle to strong. Some of the soils support a - <br />coniferous forest, some have a cover of grass, others have <br />aspen trees, and still others have mixtures of these plants. <br />These soils are moderately extensive in the high mountains of <br />• the western states (1). <br />The Splitrosoil series belongs to the subgroup Lithic Cryoboroll. <br />Lithic Cryoborolls <br />These soils have a shallow lithic contact. Because hardrock is <br />present at a shallow depth, they are permitted but are not <br />required to have a calcic horizon, a mollic epipedon that is <br />between 40 and 50 cm thick, or a pergelic temperature regime. <br />There may be a Iambic horizon or a ca horizon between the <br />epipedon and the rock, or the epipedon may extend to the rock. <br />Slopes of these soils is the United States are mostly strong or <br />very strong, and the soils are used mainly for summer grazing <br />(1). <br />The Winevada soils series belongs to the subgroup Pachic Cryo- <br />borolls . <br />• <br />