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C - 8 to 20 inches; pale brown (10YR 6/3) extremely <br />channery sandy loam, yellowish brown (10YR 5/4) <br />moist; weak fine angular blocky structure; soft, very <br />friable, nonsticky and nonplastic; 45 percent <br />channers, 20 percent flagstones; strongly <br />effervescent; moderately alkaline; abrupt smooth <br />boundary. <br />C2 - 20 to 28 inches; light gray (10YR 7/2) channery <br />clay loam, pale brown (10YR 6/3) moist; weak <br />medium blocky structure; slightly hard, friable, sticky <br />and slightly plastic; 20 percent channers, 60 percent <br />soft shale fragments; strongly effervescent; <br />moderately alkaline. <br />Borolls Series <br />Map Unit. 206 <br />Depth class: moderately deep to very deep <br />Drainage Class: well drained <br />Slowest permeability: 0.2 to 0.6 in./hr. (moderately <br />slow) <br />Landform: mountainsides <br />Position on landform: backslopes, footslopes <br />Parent material. residuum and colluvium derived <br />from sedimentary rocks <br />Elevation: 7,000 to 8,500 feet (2,134 to 2,591 <br />meters) <br />Slope: 25 to 75 percent <br />Climatic data: <br />(406 to 508 millimeters) <br />Mean annual air temperature: 37 to 45 <br />degrees F (2.8 to 7.2 degrees C) <br />Frost -free period: 50 to 85 days <br />Taxonomic class: Borolls <br />Typical Pedon <br />Map Unit in which located. Ustorthents, frigid-Borolls <br />complex, 25 to 75 percent slopes <br />Al - 0 to 10 inches; very dark grayish brown (10YR <br />3/2) loam, very dark brown (10YR 2/2) moist; <br />moderate find granular structure; soft, very friable, <br />slightly sticky and slightly plastic; neutral; clear <br />smooth boundary. <br />Range in Characteristics <br />Particle -size control section (weighted average) <br />Rock fragment content. 15 to 65 percent <br />Depth to effervescence: 5 or more inches <br />Depth to lithic or paralithic contact. 10 to 30 inches <br />A horizon: <br />Hue: 7.5YR throuoh 2.5Y <br />Texture: very channery sandy loam, channery <br />clay loam, or channery loam <br />C and C2 horizons: <br />Hue: 5YR through 2.5Y <br />Texture: extremely channery sandy loam, <br />channery clay loam, or channery loam <br />A2 - 10 to 19 inches; dark grayish brown (10YR 4/2) loam, <br />very dark grayish brown (10YR 4/2) moist; moderate <br />medium subangular blocky structure parting to weak fine <br />subangular blocky; soft, very friable, sticky and slightly <br />plastic; neutral; clear smooth boundary. <br />Bw - 19 to 30 inches; grayish brown (10YR 5/2) cobbly <br />sandy clay loam, dark grayish brown (10YR 4/2) moist; <br />moderate medium subangular blocky structure parting to <br />moderate fine subangular blocky; slightly hard, friable, <br />sticky and slightly plastic; 10 percent gravel, 20 percent <br />cobbles, neutral; abrupt wavy boundary. <br />Range in Characteristics <br />Depth to lithic or paralithic contact: 20 to 80 inches <br />Hue: 2.5YR to 2.5Y <br />Thickness of the mollic epipedon: 10 to 30 inches <br />Note: The depth to horizons containing calcium carbonate <br />commonly is 40 inches or more. These soils are in the <br />loamy -skeletal, coarse -loamy, fine -loamy, and fine <br />particle -size classes. Some pedons contain argillic, <br />cambic, or calcic horizons. <br />