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ADVANCED COPY SUBJECT TO CHANGE <br />• <br />• <br />?J <br />987-Argiustolls-Ustorthents, <br />shale complex, 30 to 80 percent <br />slopes <br />Map Unit Setting <br />Major Land Resource Area: 48A <br />Elevation: 7,200 to 8,790 feet (2,195 to 2,680 <br />meters) <br />Mean annual precipitation: 14 to 24 inches (356 <br />to 610 millimeters) <br />Mean annual air temperature: 43 to 45 degrees <br />F. (6.1 to 7.2 degrees C.) <br />Frost-free period: 80 to 115 days <br />Map Unit Composition <br />Argiustolls and similar soils: 50 percent <br />Ustorthents, shale and similar soils: 30 percent <br />Minor components: <br />Component Descriptions <br />Argiustolls soils <br />Landform: Mountain slopes <br />Parent material: Slope alluvium derived from <br />mixed sources, colluvium derived from <br />volcanic breccia, silty and clayey slope <br />alluvium derived from calcareous shale over <br />silty and clayey residuum weathered from <br />calcareous shale <br />Slope: 30 to 80 percent <br />Surface fragments: None <br />Depth to restrictive feature: 20 to greater than 60 <br />inches to bedrock (paralithic) <br />Drainage class: Well drained <br />Slowest permeability..06 to 0.2 in/hr (slow) <br />Available water capacity. About 6.5 inches <br />(moderate) <br />Shrink-swell potential: About 3.6 percent <br />(moderate) <br />Flooding hazard: None <br />Ponding hazard: None <br />Seasonal high water table depth: Greater than <br />60 inches <br />Runoff class: Very high <br />Calcium carbonate maximum: About 40 percent <br />Gypsum maximum: About 2 percent- <br />Salinity maximum: About 2 mmhos/cm <br />(nonsaline) <br />Sodium adsorption ratio maximum: About 2 <br />(slightly sodic) <br />Ecological site: Brushy Loam Range Site # 238 <br />Potential native vegetation: Gamble oak, Utah <br />serviceberry, Elk sedge, Slender <br />wheatgrass, Western wheatgrass, Mountain <br />brome, Nodding brome, Letterman <br />needlegrass, Prairie junegrass, Common <br />chokecherry, Mountain snowberry, Woods <br />rose <br />Land capability subclass (irrigated): Unspecified <br />Land capability subclass (nonirrigated): 8 <br />Typical Profile: <br />Oi-0 to 1 inches; slightly decomposed plant <br />material <br />A-1 to 8 inches; loam <br />Bt-8 to 16 inches; clay loam <br />Btk1-16 to 22 inches; clay loam <br />Btk2-22 to 28 inches; clay loam <br />BCk-28 to 36 inches; clay loam <br />Cr-36 to 50 inches; soft shale bedrock <br />Ustorthents, shale soils <br />Landform: Mountain slopes <br />Parent material. Silty and clayey residuum <br />weathered from shale <br />Slope: 30 to 80 percent <br />Surface fragments: About 5 percent angular <br />channers <br />Depth to restrictive feature: 4 to 40 inches to <br />bedrock (paralithic) <br />Drainage class: Well drained <br />Slowest permeability: .00 1 to .06 in/hr (very <br />slow) <br />Available water capacity. About 1.2 inches (very <br />low) <br />Shrink-swell potential. About 3.0 percent <br />(moderate) <br />Flooding hazard. None <br />Ponding hazard: None <br />Seasonal high water table depth: Greater than <br />paralithic contact <br />Runoff class: Very high <br />Calcium carbonate maximum: About 25 percent <br />Gypsum maximum: About 2 percent <br />Salinity maximum: About 8 mmhos/cm (slightly <br />saline) <br />Sodium adsorption ratio maximum: About 2 <br />(slightly sodic) <br />Ecological site: Mountain Shale Range Site <br />#244 <br />Potential native vegetation: Western <br />wheatgrass, Mountain big sagebrush, <br />Muttongrass, Bottlebrush squirreltail, <br />Letterman needlegrass, Saskatoon <br />serviceberry, true mountain mahogany, <br />Twogrooved milkvetch, Rubber rabbitbrush, <br />Hoods phlox <br />Land capability subclass (irrigated): Unspecified <br />Land capability subclass (nonirrigated): 8 <br />Typical Profile: <br />A-0 to 3 inches; silt loam <br />C-3 to 7 inches; extremely paragravelly silt <br />loam <br />Cr1-7 to 10 inches; soft shale bedrock <br />Cr2-10 to 22 inches; moderately hard shale <br />bedrock <br />DAD 2/03