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450 <br />A-0 to 4 inches; light gray (2.5Y 7/2) channery silty <br />clay loans, Tight brownish gray (2.5Y 6/2) moist; <br />moderate medium platy structure parting to <br />moderate medium granular; slightly hard, friable, <br />sticky and plastic; 20 percent channers; strongly <br />effervescent; moderately alkaline; clear smooth <br />boundary. <br />AC-4 to 9 inches; pale yellow (2.5Y 7/4) silty clay <br />loam, light yellowish brown (2.5Y 6/4) moist; <br />massive; slightly hard, friable, sticky and plastic; <br />60 percent weakly consolidated shale fragments; <br />strongly effervescent; moderately alkaline; clear <br />wavy boundary. <br />C--9 to 15 inches; pale yellow (2.5Y 7/4) silty clay <br />loam, light yellowish brown (2.5Y 6/4) moist; platy <br />rock structure; 75 percent weakly consolidated <br />shale fragments; strongly effervescent; <br />moderately alkaline; clear wavy boundary. <br />Cr-15 inches; weakly consolidated shale. <br />Range in Characteristics <br />Depth to paralithic contact. 10 to 20 inches <br />C horizon: <br />Texture: silty clay loam, clay loam, or clay <br />Weed Series <br />Map unit(s): 209 <br />Local phase(s): none specified <br />Depth class: very deep <br />Drainage class. well drained <br />Slowest permeability. 0.6 to 2.0 in./hr. (moderate) <br />Landform: alluvial fans, hills <br />Position on Lndform: toeslopes <br />Parent material: alluvium derived from sandstone <br />Elevation: 6,300 to 7,400 feet (1,920 to 2,256 meters) <br />Slope: 1 to 12 percent <br />Climatic data: <br />Mean annual precipitation: 13 to 15 inches (330 <br />to 381 millimeters) <br />Mean annual air temperature: 42 to 45 degrees F. <br />(5.6 to 7.2 degrees C.) <br />Frost-free period. 75 to 95 days <br />Taxonomic class: Fine-loamy, mixed Pachic <br />Argiborolls <br />Typical Pedon <br />Map unit in which located. Weed sandy loam, 1 to 12 <br />percent slopes <br />Location in the survey area: about 1,000 feet south <br />and 500 feet west of the northeast corner of sec. <br />15,17 N., R. 93 W. <br />Ai-0 to 5 inches; brown (10YR 4/3) sandy loam, <br />Soil Survey <br />very dark grayish brown (10YR 312) moist; weak <br />fine granular structure; soft, very friable, <br />nonsticky and nonplastic; neutral; clear smooth <br />boundary. <br />A2--5 to 10 inches; brown (10YR 4/3) sandy loam, <br />dark brown (10YR 3/2) moist; weak medium <br />subangular blocky structure; slightly hard, triable, <br />slightly sticky and slightly plastic; neutral; gradual <br />smooth boundary. <br />1311-10 to Winches; brown (10YR 5/3) sandy clay <br />loam, dark grayish brown (10YR 3/2) moist; <br />moderate medium subangular blocky structure <br />parting to moderate fine subangular blocky; hard, <br />firm, sticky and plastic; few faint clay films on <br />faces of peds; neutral; gradual smooth boundary. <br />Bt2-18 to 28 inches; yellowish brown (10YR 5/4) <br />sandy clay loam, brown (10YR 4/3) moist; <br />moderate medium subangular blocky structure <br />parting to moderate fine subangular blocky; hard, <br />firm, sticky and plastic; few faint clay films on <br />faces of peds; mildly alkaline; gradual smooth <br />boundary. <br />Bk1-28 to 32 inches; yellowish brown (10YR 5/4) <br />sandy clay loam, dark brown (10YR 413) moist; <br />weak medium subangular blocky structure <br />parting to weak fine subangular blocky; hard, <br />firm, sticky and plastic; slightly effervescent; <br />mildly alkaline; gradual smooth boundary. <br />Bk2-32 to 41 inches; light yellowish brown (10YR <br />6/4) sandy clay loam, dark brown (10YR 5/3). <br />moist; weak medium subangular blocky structure <br />parting to weak fine subangular blocky; hard,. <br />firm, sticky and plastic; strongly effervescent; <br />moderately alkaline; clear smooth boundary. <br />Bk3-41 to 60 inches; very pale brown (10YR 7/3) <br />sandy loam, light yellowish brown (10YR 6/4) <br />moist; weak medium subangular blocky structure; <br />slightly hard, friable, slightly sticky and slightly <br />plastic; violently effervescent; moderately <br />alkaline. <br />Range in Characteristics <br />Depth to argillic horizon: 25 to 35 inches <br />Depth to secondary calcium carbonate: 25 to 35 <br />inches <br />A horizon: <br />Reaction: neutral or mildly alkaline <br />Bt horizon: <br />Hue: 10YR or 7.5YR <br />Texture: sandy clay loam or clay loam <br />Reaction: neutral or mildly alkaline <br />Bk1 and Bk2 horizons: <br />Texture: loam or sandy clay loam