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4-65 <br />• derived from sandstone. Elevation range is 5,350 to 5,600 feet. <br />Annual precipitation is about 10 inches. The mean annual soil <br />temperature ranges form 47° to 54° F., and the frost-free period <br />is 105 to 135 days. The vegetation is big sagebrush-shrubland. <br />The Nihill series is a member of the loamy-skeletal, mixed <br />(calcareous}, mesic family of Ustic Torriorthents. A representa- <br />tive profile of Ylihill loam, sample point MC 3, about 1,335 feet <br />east and 2,480 feet south of the northwest corner of Section 21, <br />T. 7 S., R. 102 W. at an elevation of 5,470 feet in the McClane <br />Canyon Permit area, approximately 1.0 miles north, is: <br />All 0 to 7 inches; pale brown (lOYR 6/3) loam, brown <br />(lOYR 5/3) moist; moderate thin platy structure; <br />soft, friable, slightly sticky and slightly plastic; <br />calcareous, pH 7.3; gradual smooth boundary. <br />A12 7 to 16 inches; pale brown (lOYR 6/3) very fine <br />sandy clay loam, brown (lOYR 5/3) moist; moderate <br />thin platy and moderate fine angular blocky structure; <br />slightly hard, friable, slightly sticky and plastic; <br />calcareous; 3 to 5 percent gravels; pH 7.4; clear <br />smooth boundary. <br />Clca 16 to 30 inches; light brownish gray (lOYR 6/2) <br />gravelly very fine sandy clay loam, grayish brown <br />(lOYR 5/2) moist; moderate fine sub-angular structure; <br />slightly hard, very friable, sticky and plastic; cal- <br />. careous; 20 to 15 percent gravels, 15 percent cobbles, <br />