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Custom Soil Resource Report <br />Summit <br />The topographically highest position of a hillslope. It has a nearly level (planar or <br />only slightly convex) surface. <br />Surface layer <br />The soil ordinarily moved in tillage, or its equivalent in uncultivated soil, ranging <br />in depth from 4 to 10 inches (10 to 25 centimeters). Frequently designated as the <br />"plow layer," or the "Ap horizon." <br />Surface soil <br />The A, E, AB, and EB horizons, considered collectively. It includes all subdivisions <br />of these horizons. <br />Talus <br />Rock fragments of any size or shape (commonly coarse and angular) derived from <br />and lying at the base of a cliff or very steep rock slope. The accumulated mass of <br />such loose broken rock formed chiefly by falling, rolling, or sliding. <br />Taxadjuncts <br />Soils that cannot be classified in a series recognized in the classification system. <br />Such soils are named for a series they strongly resemble and are designated as <br />taxadjuncts to that series because they differ in ways too small to be of <br />consequence in interpreting their use and behavior. Soils are recognized as <br />taxadjuncts only when one or more of their characteristics are slightly outside the <br />range defined for the family of the series for which the soils are named. <br />Terminal moraine <br />An end moraine that marks the farthest advance of a glacier. It typically has the <br />form of a massive arcuate or concentric ridge, or complex of ridges, and is <br />underlain by till and other types of drift. <br />Terrace (conservation) <br />An embankment, or ridge, constructed across sloping soils on the contour or at a <br />slight angle to the contour. The terrace intercepts surface runoff so that water <br />soaks into the soil or flows slowly to a prepared outlet. A terrace in a field generally <br />is built so that the field can be farmed. A terrace intended mainly for drainage has <br />a deep channel that is maintained in permanent sod. <br />Terrace (geomorphology) <br />A steplike surface, bordering a valley floor or shoreline, that represents the former <br />position of a flood plain, lake, or seashore. The term is usually applied both to the <br />relatively flat summit surface (tread) that was cut or built by stream or wave action <br />and to the steeper descending slope (scarp or riser) that has graded to a lower <br />base level of erosion. <br />Terracettes <br />Small, irregular steplike forms on steep hillslopes, especially in pasture, formed <br />by creep or erosion of surficial materials that may be induced or enhanced by <br />trampling of livestock, such as sheep or cattle. <br />55 <br />