Abstract

Samples from six Pleistocene barrier coastlines and the Holocene coast are used to evaluate the statistical parameters for distinguishing ancient and modern sedimentary environments. The sediments from each barrier coastline can be divided into lagoon-salt marsh and barrier island facies. The former include estuarine and tidal channel sediments whereas the barrier facies also include dune, littoral, shallow neritic, and offshore channel deposits. Barrier island sands are better sorted than those from the lagoon-salt marsh, the coarsest being found in tidal inlets and channels, and about 70 percent of the samples are negatively skewed. More than 90 percent of the Holocene beach sands are negatively skewed, but about 70 percent of the dune sands show positive skewness. The sign of skewness is related to the energy variations in different sedimentary environments.

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