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1 <br />1 <br />t <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />I <br />7/sz <br />37 <br />R29F--Earsman Rock outcrop complex, 12 to 65 percent slopes. This <br />map unit is on mountain sides and ridges. Elevation Ss 6,000 to 8,500 feet. <br />The average annual precipitation is 11 to 16 inches, the average annual air <br />temperature is 42 to 44 degrees F, and the average frost-free period is 70 to <br />105 days. <br />This unit is 45 percent Earsman very stony sandy loam and 35 percent Rock <br />outcrop. Earsman soils occur on less steep slopes and the Rock outcrop <br />portion is in steeper convex areas throughout the complex. The components of <br />this unit are so intricately intermingled that it was not practical to map <br />them separately at the scale used. <br />Included in this unit are small areas of Arle soils, Ansari soils and <br />similar soils which are deeper to bedrock. Included areas make up about 20 <br />percent of the total acreage. <br />The Earsman soil is shallow and somewhat excesslvely drained. It formed <br />in residuum and colluvium derived dominantly from redbed calcareous <br />sandstone. Typically, the surface Ss covered with 5 to 10 percent flagstones <br />and 5 to 15 percent channery fragments. A thin layer of partially decomposed <br />needles, twigs, and leaves is on the surface in many places. The surface <br />layer is reddish brown very stony sandy loam 5 inches [hick. The upper 9 <br />inches of the underlying material is very channery sandy loam. The lower <br />part to a depth of 19 inches is very channery sandy loam. Depth [o hard <br />calcareous sandstone ranges from l0 to 20 inches. <br />Permeability of the Earsman soil is moderately rapid. Available water <br />capacity is very low. Effective rooting depth is LO to 20 inches. Runoff is <br />rapid, and the hazard of water erosion is very high. <br />23 <br />