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Section 779.21 (a) Continued. • Elevations range from 7,500 to 8,500 feet. Slopes range from 0 to 30 or more percent. The everage annual precipitation ranges from 15 to 20 inches. The mean soil temperature is about 40 to 45 degrees F., and the frost-free season is approximately 40 to 55 days. This map unit covers about 637,000 acres. Argic Cryoborolls make up abcut 45 percent of this map unit and Cryic Paleborolls about 45 percent. The remaining 10 percent is composed of soils with less-developed subsoils; some sandy soils and some clayey soils; and small areas of rock outcrop. Argic Cryoborolls: These moderatel}• deep to deep, well-drained, dark-colored, loamy soils usually contain less than 35 percent rock fragments but sometimes will contain up to 85 percent. They are nearly level to moderately steep soils of the high mountains and occur on valley sideslopes, ridge crests, and alluvial fans. T'i~ey • have slopes of 0 to 30 percent or more. Depth to bedrock is usually between 20 and 60 inches but is deeper than this in some areas. Permeability and the shrink-swell and frost action po- tentials generally are moderate. Typically, these soils have neutral surface layers grading to moderately alkaline in the lower part. Cryic Paleborolls: These deep, dark-colored, well-drained, loamy soils usually contain less than 35 percent rock fragments. They are on nearly level to moderately steep mountainsides, ridge crests, and alluvial fans and have slopes of 0 to 30 percent or more. Depth to bedrock i.s usually more than 60 inches but may be within 40 inches in some areas. Permeability and shrink-swell potential are generally moderate, and the frost action potential is moderate to high. Typically, these soils are neutral to mildly alkaline in the surface layers and neutral to moderately alkaline in the lcwer part. C J 779-251