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from sandstone and marlstone. The average annual precipitation <br />• is about 20 inches, the average annual air temperature is about <br />40 degrees F., and the average frost-free period is less than 75 <br />days. The Irigul soil makes up about 55 percent of the mapping <br />unit and occupies mountainsides and the less windswept positions <br />on the landscape. Starman soil makes up about 30 percent of the <br />mapping unit and occupies the ridge crest positions. <br />Refer to Mapping Unit 6CF - Irigul channery loam for a description <br />of soil properties and classification. <br />Typically, the surface layer of the Starman soil is brown, calca- <br />reous, channery loam about 3 inches thick. The subsurface layer <br />is pale brown, calcareous, very channery loam about 4 inches thick. <br />The underlying material is very pale brown, strongly calcareous, <br />extremely channery loam about 6 inches thick and overlies bedrock. <br />Its reaction ranges from moderately alkaline to strongly alkaline. <br />• These soils occur at high elevations and in a 20 inch precipita- <br />tion zone. The position they occupy on ridges where the wind <br />sweeps the snow off in the winter results in a very low effective <br />precipitation. <br />Rock fragments in the A horizon range from 20 to 40 percent and <br />are mostly fine channery in size. Rock fragments in the AC and <br />Cca horizon range from 65 to 75 percent and are dominantly 3/4 <br />to 3 inches in length. The percentage of coarse fragments greater <br />than 3 inches increases near lithic contact. Depth to the lithic <br />contact is 5 to 20 inches. <br />Permeability of the Starman soil is moderate. The effective rooting <br />depth is about 10 to 20 inches with capacity for available water <br />flow. The surface runoff and erosion hazard are slight, and the <br />capability subclass is VIIs. <br />• <br />I-11 <br />