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Section 779.2]. (a) Continued. • Typic Paleborolls: These deep, dark-colored, well-drained, clayey soils usually contain less th~.n 35 percent rock fragments. They are on gently sloping to moderately steep uplands and have slopes of 2 to about 30 percent. Depth to rinpable bedrock is 40 to over 60 inches. Permeability is slow, and the shrink-swell and frost action potentials are high. Typically, these soils have slightly acid to neutral surface layers and are mildly or moderately alkaline in the lower part. Borollic Camborthids: These moderately deep to deep, light-colored, well-drained, clayey soils usually ccntain less than 35 percent reek fragments. They are on gently slopino. to moderately steep uplands dominated by the underlying soft sedimentary bedrock. They have slopes of 2 to about 30 percent. Depth to rippable bedrock ranges from 20 to 40 or more inches. Permeability is slow, shrink- swell potential is high, and the frost action potential is moderate. Typically, these soils are mildly alkaline in the upper layers and • moderately or strongly alkaline in the lower part. These soils are used for rangeland, nonirrigated cropland, and for irrigated hay and pastureland. Native vegetation is mostly big sagebrush and oakbrush with an understory of Idaho fescue, mountain brome and bluegrass; however, in some areas aspen is dominant. Potential for agriculture is severely limited by the cold climate and short growing season. Low strength and shrink-swell are limi- tations for most nonagricultural uses. Acgic Cryoborolls--Cryic Paleborolls: loamy; nearly level to moder- ately steep. This map unit is in the northwestern part of the state in Moffat, Rio Blanco, Routt, and Jackson Counties. The soils in this unit primarily occupy mountainsides and ridges. They formed in materials weathered in place from sandstone or shale. 779-250