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Abstract
Abstract: Seismic Stratigraphy and Late Quaternary Evolution of Eastern Mississippi Sound, Alabama
ABSTRACT
Eastern Mississippi Sound is a 375 km2 shallow lagoon (average depth of 3m) extending behind Dauphin Island from Pass Aux Herons in the east to Petit Bois Pass in the west. The Pascagoula/Escatawpa fluvial-deltaic system, a main source of freshwater for Mississippi Sound, flows into the lagoon from the north about 17 km west of Grand Bay. To examine the Late Quaternary evolution of the lagoon and associated Pascagoula/Escatawpa fluvial-deltaic system, approximately 66 kilometers of high-resolution seismic chirp data (2-15 kHz, 20 ms pulse) were collected from Eastern Mississippi Sound (Fig 1). These data show four stacked unconformity
bound seismic units (Fig 2). The unconformities are interpreted to have formed during episodes of Pascagoula/Escatawpa fluvial incision. The uppermost seismic unit and unconformity was sampled by vibracores collected in 1995 by the Geological Survey of Alabama, indicating that
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the youngest unconformity is the Pleistocene/Holocene boundary, an exposure surface that formed during the last lowstand in sea level. This is an ongoing project and future work will focus on developing of a robust chronostratigraphic framework for the area.
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ACKNOWLEDGMENTS AND ASSOCIATED FOOTNOTES
Department of Geological Sciences, University of Alabama, Tuscaloosa, AL 34587-0338
Copyright © 2004 by The Gulf Coast Association of Geological Societies