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Custom Soil Resource Report <br />streamline (laminar) flow of glaciers, which molded the subglacial floor through a <br />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 from <br />the litter on the surface to underlying pure humus. <br />Dune <br />A low mound, ridge, bank, or hill of loose, windblown granular material (generally <br />sand), either barren and capable of movement from place to place or covered and <br />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 distinct <br />natural plant community. An ecological site is the product of all the environmental <br />factors responsible for its development. It is typified by an association of species <br />that differ from those on other ecological sites in kind and /or proportion of species <br />or in total production. <br />Eluviation <br />The movement of material in true solution or colloidal suspension from one place <br />to another within the soil. Soil horizons that have lost material through eluviation <br />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 boundary <br />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 precipitation. <br />It receives no long- continued supply from melting snow or other source, and its <br />channel is above the water table at all times. <br />Episaturation <br />A type of saturation indicating a perched water table in a soil in which saturated <br />layers are underlain by one or more unsaturated layers within 2 meters of the <br />surface. <br />Erosion <br />The wearing away of the land surface by water, wind, ice, or other geologic agents <br />and by such processes as gravitational creep. <br />87 <br />