Abstract

Ridges, scarps, and level plains in the coastal area from Mississippi to the Florida Panhandle have been interpreted as a succession of littoral and lagoonal landforms evolved during pre-Sangamon Pleistocene high stands of sea level. New sediment and fossil information refutes this view. Only a single late Pleistocene transgressive-regressive sequence has been documented in surface exposures and drill cores. Tectonism, reflected in hitherto unrecognized structural lineaments, was probably responsible for coastal escarpments formed in three periods. Stream segments and segments of late Pleistocene and Holocene shorelines commonly parallel the lineaments. The reason for the conspicuous absence of clearly recognizable pre-Sangamon littoral and estuarine deposits and landforms probably lies largely in the erosional history of the region, related to slow regional uplifts.

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