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A succession of elevated ridge deposits on the south Florida margin was mapped in water depths ranging from 50 to 124 m. The ridges are interpreted to be subtidal shoal complexes and paleoshorelines (eolian dune or beach) formed during the last sea-level transgression. Formation and preservation of these features are attributed to episodic and rapid changes in the rate of the deglacial sea-level rise at the onset of the termination 1A δ 18 O excursion. This high-resolution record of sea-level change appears to be related to deglacial processes operating on submillennial time scales.