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• 17AC"- " 'Cabin sandy"ldam, 2 to 5 percent slopes. <br />This soil is on old terraces and high glacial benches. Slopes <br />are 2 to 5 percent. <br />Included with this soil in mapping are a few small areas of <br />soils that are similar to Cabin soils but which have pockets of calcareous <br />material in the IIC horizon, or that are less than 5 feet deep over sand- <br />stone or shale of the Coalmont Formation. Also included are small areas <br />of Tiagos soils on narrow, low ridges. <br />Runoff is medium. The hazard of soil blowing is severe, and <br />the hazard of water erosion ie moderate. <br />Most of the acreage of this soil is used for grazing. A small <br />acreage is irrigated and used for hay and pasture. If this soil is <br />irrigated, an organic mat 1 to 4 inches thick generally forms on the <br />surface and bright, rust-coloted mottles form throughout the profile. <br />• <br />R73AE - Coalmont loam, 5 to 12 percent slopes. <br />This is a moderately deep, well-drained soil on moderately <br />sloping to strongly sloping upland hills and ridges at elevations of <br />8,000 to 8,300 feet. It formed in material weathered from Coalmont <br />Shale. The average annual precipitation is 10 to 12 inches, the average <br />annual air temperature is 37 to 38 degrees F., and the frost-free season <br />is 35 to 45 days. <br />Included in this unit are Fluetach, Cryorthents and a few small <br />areas of Aaberg soils. <br />Typically the surface layer is light brownish gray loam about <br />four inches thick. The subsoil is grayish brown and light brownish gray <br />clay about 16 inches thick. The underlying material is light yellowish <br />• brown clay loam. Calcareous clay shale is at a depth of about 30 inches. <br />