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Eolian Cross-Bedding in the Beach Dune Environment, Sapelo Island, Georgia
Lynton S. Land (3)
The slipfaces of modern beach dunes on Sapelo Island, Georgia, are deposited by the prevailing, competent, dry winds rather than the high energy storm winds. High angle cross-bedding (cross-bedding which dips at least 30°) records the orientation of the prevailing winds. Approximately one-half the dune slipfaces and high angle cross-beds are stable at angles which exceed the angle of repose of dry sand, and cross-bed dips as high as 42° are stable in, and may be indicative of, the beach dune environment. Elongate sand grains are preferentially oriented parallel to the dip direction of the eolian cross-beds.
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