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generally is built so that the field can be farmed. A terrace intended mainly for <br />drainage has 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 <br />former position of a flood plain, lake, or seashore. The term is usually applied <br />both to the relatively flat summit surface (tread) that was cut or built by stream <br />or wave action and to the steeper descending slope (scarp or riser) that has <br />graded to a lower 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 />Texture, soil <br />The relative proportions of sand, silt, and clay particles in a mass of soil. The <br />basic textural classes, in order of increasing proportion of fine particles, are <br />sand, loamy sand, sandy loam, loam, silt loam, silt, sandy clay loam, clay loam, <br />silty clay loam, sandy clay, silty clay, and clay. The sand, loamy sand, and <br />sandy loam classes may be further divided by specifying “coarse,” “fine,” or <br />“very fine.” <br />Thin layer <br />Otherwise suitable soil material that is too thin for the specified use. <br />Till <br />Dominantly unsorted and nonstratified drift, generally unconsolidated and <br />deposited directly by a glacier without subsequent reworking by meltwater, and <br />consisting of a heterogeneous mixture of clay, silt, sand, gravel, stones, and <br />boulders; rock fragments of various lithologies are embedded within a finer <br />matrix that can range from clay to sandy loam. <br />Till plain <br />An extensive area of level to gently undulating soils underlain predominantly by <br />till and bounded at the distal end by subordinate recessional or end moraines. <br />Tilth, soil <br />The physical condition of the soil as related to tillage, seedbed preparation, <br />seedling emergence, and root penetration. <br />Toeslope <br />The gently inclined surface at the base of a hillslope. Toeslopes in profile are <br />commonly gentle and linear and are constructional surfaces forming the lower <br />part of a hillslope continuum that grades to valley or closed-depression floors. <br />Custom Soil Resource Report <br />64 Index #10