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Surface Texture-San Miguel Area, Colorado, Parts of Dolores, Montrose, and <br />San Miguel Counties <br />J-Bird Mine Site <br />Surface Texture <br />Surface Texture-Summary by Map Unit-San Miguel Area, Colorado, Parts of Dolores, Montrose, and San Miguel Counties <br />Map unit symbol Map unit name Rating Acres in AOI Percent of AOI <br />108 Wrayha stony clay loam, 3 to <br />40 percent slopes stony clay loam 7.3 100.0% <br />Totals for Area of Interest 7.3 100.0% <br />Description <br />This displays the representative texture class and modifier of the surface horizon. <br />Texture is given in the standard terms used by the U.S. Department of Agriculture. <br />These terms are defined according to percentages of sand, silt, and clay in the <br />fraction of the soil that is less than 2 millimeters in diameter. "Loam," for example, <br />is soil that is 7 to 27 percent clay, 28 to 50 percent silt, and less than 52 percent <br />sand. If the content of particles coarser than sand is 15 percent or more, an <br />appropriate modifier is added, for example, "gravelly." <br />Rating Options <br />Aggregation Method. Dominant Condition <br />Aggregation is the process by which a set of component attribute values is reduced <br />to a single value that represents the map unit as a whole. <br />A map unit is typically composed of one or more "components". A component is <br />either some type of soil or some nonsoil entity, e.g., rock outcrop. For the attribute <br />being aggregated, the first step of the aggregation process is to derive one attribute <br />value for each of a map unit's components. From this set of component attributes, <br />the next step of the aggregation process derives a single value that represents the <br />map unit as a whole. Once a single value for each map unit is derived, a thematic <br />map for soil map units can be rendered. Aggregation must be done because, on <br />any soil map, map units are delineated but components are not. <br />For each of a map unit's components, a corresponding percent composition is <br />recorded. A percent composition of 60 indicates that the corresponding component <br />typically makes up approximately 60% of the map unit. Percent composition is a <br />critical factor in some, but not all, aggregation methods. <br />USDA Natural Resources Web Soil Survey 2.1 12/24/2008 <br />?? Conservation Service National Cooperative Soil Survey Page 3 of 4