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Custom Soil Resource Report <br />in the circumstances of deposition and may show a parting, a color difference, a <br />change in particle size, or various combinations of these. The term is commonly <br />applied to any bedding surface, even one that is conspicuously bent or deformed <br />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 is <br />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 contour, <br />supported by a barrier of rocks or similar material, and designed to make the soil <br />suitable for tillage and to prevent accelerated erosion. <br />Bisequum <br />Two sequences of soil horizons, each of which consists of an illuvial horizon and <br />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 adjoining <br />accumulation of sand derived from the depression, where recognizable, is <br />commonly included. Blowouts are commonly small. <br />Borrow pit (map symbol) <br />An open excavation from which soil and underlying material have been removed, <br />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 />21 <br />