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Sedimentary structures in carbonate sands of portions of the Great Bahama Bank are described and interpreted using data from air photographs, visual inspection of the bottom, echo-sounding traverses, and 50 box-cores impregnated with epoxy resin. Surface forms described include: avalanche ripples, with angle-of-repose lee slopes; accretion ripples, with lee slopes less than the angle of repose; flat, swash surfaces; large-scale current lineations on the order of 1000 feet long; bars; and irregular shoals. Strata are classed as avalanche deposits if they are cross-strata dipping at the angle of repose with coarser particles concentrated down their dip; accretion deposits if...

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