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After the formation of barrier islands, sediment accumulation in the lagoon produces two major “surfaces” which form concurrently at the base and top of estuarine deposits. These surfaces range from less than one-half to more than 30 kilometers wide, and are separated by as much as 30 meters of estuarine sediment. The basal surface is erosional and is shaped by the shifting estuarine channels. Relief may be as much as several meters; the surface is undulatory and slopes gently seaward. Basal estuarine deposits are clayey sands and gravels. Gravels commonly are angular, and cut and fill structures and cross-stratification are...

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