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The sorting processes responsible for the development of bedding in cross-bedded deposits were studied in a small laboratory flume. Flow separation over the foreset slope of the deposit is the primary factor responsible for the dispersion and sorting of the various grain sizes. Important sorting processes include selective transport due to differential settling velocity, pulsatory movement of particles, and dispersive pressure. The bedded structure in a foreset deposit characteristically reflects the segregation of grain sizes that occurs along the topset (backset) deposit. The reworking of the foreset slope by fluid turbulence causes small variations in grain fabric and packing that may accentuate the definition of the cross-bedded structure.
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Alan V. Jopling (1964) studied this question.
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