Abstract
ABSTRACT Backset bedding was produced in a laboratory flume by feeding sand into a shooting (supercritical) flow that terminated downstream in a hydraulic jump. Sediment accumulated as a mound at the site of the jump, increasing the tailwater depth and causing the jump to move upstream. Concurrent with the upstream movement of the jump, there was a growth of the sediment mound in both the upstream and downstream directions. The downstream growth of the mound formed typical foreset bedding, whereas the upstream growth of the mound resulted in the deposition of backset bedding inclined in the up-current direction. Backset bedding was also produced in experiments where antidune and chute and pool bed configurations were formed in a recirculating flume. These experiments support Davis' theory of the origin of backset bedding in the fluvioglacial outwash deposits of New England and offer a plausable explanation for the origin of this type of cross-bedding in other sedimentary formations.
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