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Custom Soil Resource Report <br /> 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 Iandforms 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 /> 34 <br />