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Sequum <br />A sequence consisting of an illuvial horizon and the overlying eluvial horizon. <br />(See Eluviation.) <br />Series, soil <br />A group of soils that have profiles that are almost alike, except for differences in <br />texture of the surface layer. All the soils of a series have horizons that are <br />similar in composition, thickness, and arrangement. <br />Severely eroded spot (map symbol) <br />An area where, on the average, 75 percent or more of the original surface layer <br />has been lost because of accelerated erosion. Not used in map units in which <br />“severely eroded,” “very severely eroded,” or “gullied” is part of the map unit <br />name. <br />Shale <br />Sedimentary rock that formed by the hardening of a deposit of clay, silty clay, or <br />silty clay loam and that has a tendency to split into thin layers. <br />Sheet erosion <br />The removal of a fairly uniform layer of soil material from the land surface by the <br />action of rainfall and surface runoff. <br />Short, steep slope (map symbol) <br />A narrow area of soil having slopes that are at least two slope classes steeper <br />than the slope class of the surrounding map unit. <br />Shoulder <br />The convex, erosional surface near the top of a hillslope. A shoulder is a <br />transition from summit to backslope. <br />Shrink-swell <br />The shrinking of soil when dry and the swelling when wet. Shrinking and <br />swelling can damage roads, dams, building foundations, and other structures. It <br />can also damage plant roots. <br />Shrub-coppice dune <br />A small, streamlined dune that forms around brush and clump vegetation. <br />Side slope (geomorphology) <br />A geomorphic component of hills consisting of a laterally planar area of a <br />hillside. The overland waterflow is predominantly parallel. Side slopes are <br />dominantly colluvium and slope-wash sediments. <br />Silica <br />A combination of silicon and oxygen. The mineral form is called quartz. <br />Custom Soil Resource Report <br />58 Index #10