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 at the site of the jump, increasing the tailwater depth and causing the jump to move upstream. Concurrently, the sediment mound grew in both upstream and downstream directions. Downstream growth formed typical foreset bedding, whereas upstream growth resulted in 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 fluvioglacial outwash deposits of New England and offer a plausible explanation for this type of cross-bedding in other sedimentary formations.

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