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from the preceding or following layer; a plane of deposition. It commonly marks <br />a change in the circumstances of deposition and may show a parting, a color <br />difference, a change in particle size, or various combinations of these. The term <br />is commonly applied to any bedding surface, even one that is conspicuously <br />bent or deformed by folding. <br />Bedding system <br />A drainage system made by plowing, grading, or otherwise shaping the surface <br />of a flat field. It consists of a series of low ridges separated by shallow, parallel <br />dead furrows. <br />Bedrock <br />The solid rock that underlies the soil and other unconsolidated material or that <br />is exposed at the surface. <br />Bedrock-controlled topography <br />A landscape where the configuration and relief of the landforms are determined <br />or strongly influenced by the underlying bedrock. <br />Bench terrace <br />A raised, level or nearly level strip of earth constructed on or nearly on a <br />contour, supported by a barrier of rocks or similar material, and designed to <br />make the soil suitable for tillage and to prevent accelerated erosion. <br />Bisequum <br />Two sequences of soil horizons, each of which consists of an illuvial horizon <br />and the overlying eluvial horizons. <br />Blowout (map symbol) <br />A saucer-, cup-, or trough-shaped depression formed by wind erosion on a <br />preexisting dune or other sand deposit, especially in an area of shifting sand or <br />loose soil or where protective vegetation is disturbed or destroyed. The <br />adjoining accumulation of sand derived from the depression, where <br />recognizable, is commonly included. Blowouts are commonly small. <br />Borrow pit (map symbol) <br />An open excavation from which soil and underlying material have been <br />removed, usually for construction purposes. <br />Bottom land <br />An informal term loosely applied to various portions of a flood plain. <br />Boulders <br />Rock fragments larger than 2 feet (60 centimeters) in diameter. <br />Breaks <br />A landscape or tract of steep, rough or broken land dissected by ravines and <br />gullies and marking a sudden change in topography. <br />Custom Soil Resource Report <br />28 Index #10