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22 - Bulkley silty clay, 3 to 12 percent slopes <br />Map Unit Setting <br />Major Land Resource Area: 34 <br />Gypsum maximum: About 1 percent <br />Elevation: 6,200 to 7,000 feet (1,890 to 2,134 meters) <br />Salinity maximum: About 2 mmhos/cm (nonsaline) <br />Sodium adsorption ratio maximum: About 0 <br />Map Unit Composition <br />(nonsodic) <br />Bulkley and similar soils: 80 percent <br />Ecological site: Clayey Foothills <br />Minor components: 20 percent <br />Potential native vegetation: western wheatgrass, <br />Wyoming big sagebrush, bottlebrush squirreltail, <br />Component Descriptions <br />prairie junegrass <br />Bulkley soils <br />Land capability subclass: (nonirrigated) 4e <br />Landform: Hills, alluvial fans <br />Typical profile <br />Position on landform: Toeslope <br />0 to 4 inches - silty clay <br />Parent material. Alluvium derived from shale <br />4 to 36 inches - clay <br />Slope: 3 to 12 percent <br />36 to 60 inches - silty clay <br />Drainage Class: Well drained <br />Slowest permeability..001 to 0.6 in./hr. (very slow) <br />Minor Components <br />Available water capacity. About 8.9 inches (high) <br />Pricecreek and similar soils <br />Shrink -swell potential: About 7.5 percent (high) <br />Composition: About 10 percent <br />Runoff class: Very high <br />Abor and similar soils <br />Calcium carbonate maximum: About 10 percent <br />Composition: About 10 percent <br />Bulkley Series <br />Bk1 - 21 to 36 inches; brown (10YR 5/3) clay, <br />Map Units: 22 <br />yellowish brown (10YR 5/4) moist; moderate very <br />Depth Class: very deep <br />coarse subangular blocky structure parting to <br />Drainage class: well drained <br />moderate coarse subangular blocky structure; <br />Slowest permeability. 0.001 to 0.6 in./hr. (very slow) <br />extremely hard, very firm, very sticky and very <br />Landform: alluvial fans, hills, hill -slopes <br />plastic; many slickensides; common coarse soft <br />Parent material. alluvium and residuum derived from shale, <br />alluvium derived from shale, colluvium derived from shale, <br />residuum derived from shale <br />Elevation: 6,200 to 8,300 feet (1,890 to 2,530 meters) <br />Slope: 3 to 45 percent <br />Climatic data: <br />Mean annual precipitation: 13 to 17 inches (330 to 432 <br />millimeters) <br />Mean annual air temperature: 40 to 45 degrees F. (4.4 to <br />7.2 degrees C.) <br />Frost -free period: 75 to 95 days <br />Taxonomic class: Fine, montmorillonitic, frigid Udorthentic <br />Chromusterts <br />Typical Pedon <br />Map Unit in which located: Bulkley silty clay, 12 to 25 <br />percent slopes <br />A - 0 to 4 inches; light yellowish brown (2.5YR 6/4) silty <br />clay, brown (10YR 4/3) moist; moderate medium <br />subangular blocky structure; hard, firm, very sticky and <br />very plastic; mildly alkaline; clear smooth boundary. <br />Bw - 4 to 21 inches; brown (10YR 5/3) clay, yellowish <br />brown (10YR 5/4) moist; strong coarse subangular blocky <br />structure; extremely hard, very firm, very sticky and very <br />plastic; mildly effervescent; mildly alkaline; gradual wavy <br />effervescent; moderately alkaline; clear wavy <br />boundary. <br />Bk2 - 36 to 60 inches; brown (10YR 5/3) silty clay, <br />light olive brown (2.5Y 5/4) moist; weak coarse <br />subangular blocky structure parting to weak <br />medium subangular blocky structure; very hard, <br />very firm, very sticky and very plastic; common <br />slickensides; common fine masses of calcium <br />carbonate; strongly effervescent; moderately <br />alkaline; clear wavy boundary. <br />Range in Characteristics <br />Hue: 10YR or 2.5Y <br />Note: This soil commonly is effervescent at a depth <br />of 0 to 15 inches. When the soil dries, it develops <br />cracks Y2 to 3/4 inches wide to a depth of 20 inches <br />or more. - <br />A horizon: <br />Reaction: neutral through moderately alkaline <br />Bw horizon: <br />Reaction: neutral through moderately alkaline <br />Bw horizon: <br />Texture: silty clay or clay <br />