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Custom Soil Resource Report <br />Clay <br />As a soil separate, the mineral soil particles less than 0.002 millimeter in diameter. <br />As a soil textural class, soil material that is 40 percent or more clay, less than 45 <br />percent sand, and less than 40 percent silt. <br />Clay depletions <br />See Redoximorphic features. <br />Clay film <br />A thin coating of oriented clay on the surface of a soil aggregate or lining pores or <br />root channels. Synonyms: clay coating, clay skin. <br />Clay spot (map symbol) <br />A spot where the surface texture is silty clay or clay in areas where the surface <br />layer of the soils in the surrounding map unit is sandy loam, loam, silt loam, or <br />coarser. <br />Claypan <br />A dense, compact subsoil layer that contains much more clay than the overlying <br />materials, from which it is separated by a sharply defined boundary. The layer <br />restricts the downward movement of water through the soil. A claypan is <br />commonly hard when dry and plastic and sticky when wet. <br />Climax plant community <br />The stabilized plant community on a particular site. The plant cover reproduces <br />itself and does not change so long as the environment remains the same. <br />Coarse textured soil <br />Sand or loamy sand. <br />Cobble (or cobblestone) <br />A rounded or partly rounded fragment of rock 3 to 10 inches (7.6 to 25 centimeters) <br />in diameter. <br />Cobbly soil material <br />Material that has 15 to 35 percent, by volume, rounded or partially rounded rock <br />fragments 3 to 10 inches (7.6 to 25 centimeters) in diameter. Very cobbly soil <br />material has 35 to 60 percent of these rock fragments, and extremely cobbly soil <br />material has more than 60 percent. <br />COLE (coefficient of linear extensibility) <br />See Linear extensibility. <br />Colluvium <br />Unconsolidated, unsorted earth material being transported or deposited on side <br />slopes and/or at the base of slopes by mass movement (e.g., direct gravitational <br />action) and by local, unconcentrated runoff. <br />24 <br />