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Custom Soil Resource Report <br /> Fragments on the Soil Surface <br /> This table provides information about fragments on the soil surface. Surface <br /> fragments are unattached, cemented pieces of bedrock, bedrock-like material, <br /> durinodes, concretions, nodules, or pedogenic horizons (e.g., petrocalcic fragments) <br /> 2 mm or larger in diameter and woody material 20 mm or larger in diameter that are <br /> exposed at the surface of the soil. Surface fragments can be rock fragments, <br /> pararock fragments, or wood fragments. Vegetal material other than wood <br /> fragments, whether live or dead, is not included. <br /> Pct. of map unit is the percent of the map unit comprised by the component. <br /> Surface fragment cover percent is the percent of the soil surface covered by <br /> fragments 2 mm or larger in diameter(20 mm or larger in diameter for wood <br /> fragments). <br /> Distance between fragments is the average distance between surface fragments, <br /> measured between edges. <br /> Fragment size is the size based on the multiaxial dimensions of the surface <br /> fragment. <br /> Flat fragment class Length of fragment(mm) <br /> Channers 2-150 <br /> Flagstones 150-380 <br /> Stones 380-600 <br /> Boulders >=600 <br /> Nonflat fragment class Diameter(mm) <br /> Gravel 2-75 <br /> Cobbles 75-250 <br /> Stones 1 250-600 <br /> rBoulders >=600 <br /> Fragment kind is the lithology or composition of the surface fragments 2 mm or <br /> larger(20 mm or larger for wood fragments). <br /> Fragment shape is a description of the overall shape of the surface fragment. <br /> Fragment roundness is an expression of the sharpness of edges and corners of <br /> surface fragments. <br /> Fragment hardness is the hardness of the fragment. It is equivalent to the rupture <br /> resistance cemented of a surface fragment that has been air-dried and then <br /> submerged in water. <br /> Reference: <br /> United States Department of Agriculture, Natural Resources Conservation Service. <br /> National soil survey handbook, title 430-VI. (https://www.nres.usda.gov/wps/portal/ <br /> nres/site/soils/home/) <br /> 31 <br />