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• The soil temperature regime of Borolls is frigid or cryic, but some have a pergelic temperature regime. The moisture regime is commonly udic or ustic but never xeric unless the temperature regime is cryic. Borolls were formerly classified as Chernozem, Chestnut, and Brown soils in the 1938 classification. A few were classified as Solonetz and Soloth soils (1). The Routt Loam and the Skylick Loam belong to the Paleboroll great group. Paleborolls Paleborolls are Borolls that have an argillic horizon at greater than normal depth. In most of them the argillic horizon has _ evidence of destruction in the farm of thick skeletons or tongues that appear to be largely stripped of clay. The mollic epipedon • may be thin or thick, but in .most of these soils there is an eluvial horizon between the mollic epipedon and the argillic horizon. In some of the soils the eluvial horizon is an albic horizon, but commonly the chroma is too high for an albic hor- izon. These soils do not ordinarily have a horizon of carbonate or of salt accumulation. In the United States these soils are principally in the high mountains of the western states. Their temperature regime is frigid or cryic. Vegetation commonly includes aspen trees, conifers and grasses. Paleborolls are not extensive and they are relatively inaccessible. They are used principally for grazing or as water catchments. Snowfall is generally high. They were variously included with Chernozems, Brunizems, and Gray Wooded soils in the 1938 classification. • ,The Routt soil series belongs to the Cryic Paleboroll subgroup.