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Custom Soil Resource Report <br /> Drumlin <br /> A low, smooth, elongated oval hill, mound, or ridge of compact till that has a <br /> core of bedrock or drift. It commonly has a blunt nose facing the direction from <br /> which the ice approached and a gentler slope tapering in the other direction. <br /> The longer axis is parallel to the general direction of glacier flow. Drumlins are <br /> products of streamline (laminar) flow of glaciers, which molded the subglacial <br /> floor through a combination of erosion and deposition. <br /> Duff <br /> A generally firm organic layer on the surface of mineral soils. It consists of fallen <br /> plant material that is in the process of decomposition and includes everything <br /> from the litter on the surface to underlying pure humus. <br /> Dune <br /> A low mound, ridge, bank, or hill of loose, windblown granular material <br /> (generally sand), either barren and capable of movement from place to place or <br /> covered and stabilized with vegetation but retaining its characteristic shape. <br /> Earthy fill <br /> See Mine spoil. <br /> Ecological site <br /> An area where climate, soil, and relief are sufficiently uniform to produce a <br /> distinct natural plant community. An ecological site is the product of all the <br /> environmental factors responsible for its development. It is typified by an <br /> association of species that differ from those on other ecological sites in kind <br /> and/or proportion of species or in total production. <br /> Eluviation <br /> The movement of material in true solution or colloidal suspension from one <br /> place to another within the soil. Soil horizons that have lost material through <br /> eluviation are eluvial; those that have received material are illuvial. <br /> Endosaturation <br /> A type of saturation of the soil in which all horizons between the upper <br /> boundary of saturation and a depth of 2 meters are saturated. <br /> Eolian deposit <br /> Sand-, silt-, or clay-sized clastic material transported and deposited primarily by <br /> wind, commonly in the form of a dune or a sheet of sand or loess. <br /> Ephemeral stream <br /> A stream, or reach of a stream, that flows only in direct response to <br /> precipitation. It receives no long-continued supply from melting snow or other <br /> source, and its channel is above the water table at all times. <br /> 42 <br />