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Map Unit Description — Ridgway Area, Colorado, Parts of Delta, Gunnison, <br />Montrose, and Ouray Counties <br />13 to 31 inches: Weathered bedrock <br />31 to 41 inches: Weathered bedrock <br />41 to 74 inches: Unweathered bedrock <br />Minor Components <br />Loutzenhizer <br />Percent of map unit: 5 percent <br />Landform: Erosion remnants <br />Down -slope shape: Linear <br />Across -slope shape: Linear <br />Ecological site: Clayey Saltdesert (R034XY403C0) <br />East mesa <br />Percent of map unit: 5 percent <br />Landform: Basin -floor remnants, erosion remnants <br />Down -slope shape: Convex <br />Across -slope shape: Convex <br />Ecological site: Silty Saltdesert (R034XY41000) <br />Montrose <br />Percent of map unit: 3 percent <br />Landform: Alluvial fans, stream terraces <br />Landform position (three - dimensional): Tread <br />Ecological site: Salt Flats (R034XY262C0) <br />Aquisalids <br />Percent of map unit: 2 percent <br />Landform: Drainageways, marshes, sloughs <br />Down -slope shape: Linear <br />Across -slope shape: Concave, linear <br />760 —Mesa clay loam, 0 to 2 percent slopes <br />Map Unit Setting <br />Elevation: 4,800 to 6,200 feet <br />Mean annual precipitation: 8 to 10 inches <br />Mean annual air temperature: 49 to 51 degrees F <br />Frost -free period: 140 to 160 days <br />Map Unit Composition <br />Mesa and similar soils: 75 percent <br />Minor components: 25 percent <br />Description of Mesa <br />Setting <br />Landform: Stream terraces, outwash terraces <br />Landform position (three - dimensional): Tread <br />Down -slope shape: Linear <br />Across -slope shape: Linear <br />Parent material: Fine -loamy alluvium derived from sandstone over <br />gravelly glaciofluvial deposits derived from igneous, <br />metamorphic and sedimentary rock <br />USDA Natural Resources Web Soil Survey <br />Conservation Service National Cooperative Soil Survey <br />10/27/2012 <br />Page 29 of 63 <br />