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<br />Irigul series <br />The Irigul series consists of shallow, well drained soils <br />that formed in residuum from sandstone and marlstone. <br />Irigul soils are on upland ridges and mountainsides. <br />Slopes are 9 to 75 percent. The average annual precipi- <br />tation is about 20 inches, and the average annual air <br />temperature is about 40 degrees F. <br />Irigul soils are similar to Parachute and Starman soils <br />and are near Rhone, Northwater, Parachute, and Star- <br />man soils. Parachute soils are 30 to 40 inches deep aver <br />bedrock. Starman soils have a lighter colored surface <br />layer. <br />Typical pedon of Irigul channery loam, 9 to 50 percent <br />slopes, about 1,500 feet north and 850 feet east of the <br />southwest corner of section 13, T. 5 S., R. 96 W.: <br />A1-0 to 6 inches; grayish brown (10YR 5/2) channery <br />loam, dark brown (10YR 3/3) moist; weak medium <br />• platy structure parting to moderate fine granular, <br />slightly hard, very friable, slightly sticky and slightly <br />plastic; 20 percent channery rock fragments; neutral; <br />clear wavy boundary. <br />C-6 to 17 inches; yellowish brown (10YR 5/4) extreme- <br />ly channery sandy clay loam, dark yellowish brown <br />(10YR 4/4) moist; weak medium and fine subangu- <br />lar blocky structure; slightly hard, friable, sticky and <br />plastic; 70 percent channery rock fragments; mildly <br />alkaline; clear wavy boundary. <br />R-17 to 40 inches: hard fractured sandstone. <br />Depth to bedrock ranges from 10 to 20 inches. Chan- <br />nery fragments make up 15 to 35 percent of the surface <br />layer and as much as 85 percent or more of the underly- <br />ing material. Reaction is slightly acid to moderately alka- <br />line. <br />The A horizon has hue of 2.5Y or 10YR, value of 4 or <br />5 dry and 2 or 3 moist, and chroma of 2 or 3. The C <br />horizon has hue of 2.SY or tOYR. <br />• <br />