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<br />Rhone series <br />The Rhone series consists of deep, well drained soils <br />that formed in residuum from sandstone and marlstone. <br />Rhone soils are on mountainsides and ridges. Slopes are <br />5 to 70 percent. The average annual precipitation is <br />about 20 inches, and the average annual air temperature <br />is about 40 degrees F. <br />Rhone soils are similar to Silas, Northwater, and Para- <br />chute soils. Silas soils contain 0 to 15 percent rock <br />fragments throughout. Parachute soils have lithic contact <br />at a depth of 20 to 40 inches. Northwater soils have an <br />argillic horizon. <br />Typical pedon of Rhone loam, 5 to 30 percent slopes, <br />about 300 feet south and 200 feet east of the northwest <br />corner of section 13, T. 5 S., R. 96 W.: <br />A11-0 to 8 inches; brown (10YR 4/3) loam, very dark <br />grayish brown (10YR 3/2) moist; weak fine granular <br />• structure; soft, very friable, slightly sticky and slightly <br />plastic; many fine and very fine roots; neutral; clear <br />wavy boundary. <br />A12-8 to 15 inches; brawn (7.SYR 5/2) sandy clay <br />loam, dark brown (7.SYR 3/2) moist; moderate <br />medium subangular blocky structure parting to mod- <br />erate fine subangular blocky; slightly hard, friable, <br />slightly sticky and slightly plastic; neutral; clear wavy <br />boundary. <br />A13-15 to 28 inches; brown (7.SYR 5/2) sandy clay <br />loam, dark brown (7.SYR 3/2) moist; moderate <br />medium subangular blocky structure parting to weak <br />fine subangular blocky; slightly hard, friable, slightly <br />sticky and slightly plastic; neutral; clear wavy bound- <br />ary. <br />IIG-28 to 52 inches; brown (7.SYR 5/4) very channery <br />sandy clay loam, dark brown (7.SYR a: 2) moist; <br />massive; slightly hard, friable, slightly sticky and <br />slightly plastic; 40 percent channery fragments; neu- <br />tral; abrupt wavy boundary. <br />R-52 inches; fractured sandstone bedrock. <br />• <br />