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<br />Nihill series <br />The Nihill series consists of deep, well drained soils <br />that formed in channery calcareous alluvium. Nihill soils <br />are on alluvial cans and valley sides. Slopes are 1 to 25 <br />percent The average annual precipitation is about 13 <br />inches, and the average annual air temperature is about <br />48 degrees F. <br />Nihill soils are similar to Chilton soils. Chilton soils are <br />redder in hue. <br />Typical pedon of Nihill channery loam, 6 to 25 percent <br />slopes, about 1,200 feet south of the northwest corner of <br />section 21, T. 6 S., R. 96 W.: <br />Al-0 to 4 inches; light gray (10YR 7/2) channery loam, <br />grayish brown (10YR 5/2) moist; weak medium <br />granular structure; soft, friable, slightly sticky and <br />slightly plastic; 20 percent channery fragments; cal- <br />careous; moderately alkaline; clear smooth bound- <br />ary. <br />AC--4 to 11 inches; very pale brown (10YR 7/2) chan- <br />nery loam, brown (tOYR 5/3) moist; moderate <br />. medium granular structure; slightly hard, triable, <br />sticky and plastic; 30 percent channery fragments; <br />calcareous; moderately alkaline; gradual smooth <br />boundary. <br />C1ca-11 to 18 inches; very pale brown (10YR 713) very <br />channery loam, brown (10YR 5/3) moist; massive; <br />slightly hard, friable; 40 percent channery fragments; <br />common visible calcium carbonate nodules and oc- <br />casionally scattered gypsum crystals in lower part of <br />horizon; moderately alkaline; gradual wavy boundary. <br />C2ca-18 to 60 inches; very pale brown (10YR 7/3) <br />stratified extremely channery sandy loam and loam, <br />pale brown (10YR 6/3) moist; massive; slightly hard, <br />triable; 75 percent channery fragments; calcareous; <br />moderately alkaline. <br />channery fragments cover 20 to 50 percent of the <br />surface. Most coarse fragments in the C1ca and C2ca <br />horizons have thin coatings of calcium carbonate on the <br />underside and are fragments of sandstone less than 3 <br />inches long and 1!2 to 1 112 inches thick; they make up <br />more than 35 percent of the profile. Reaction is mildly <br />alkaline to moderately alkaline throughout. <br />The A and C horizons have hue of 2.SY to 7.5YR, <br />value of 5 to 7 dry and 4 to 6 moist, and chroma of 2 to <br />4 dry and moist <br />u <br />