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Presenters Notified: November 2012

Program Schedule Posted:November 2012

Abstracts Available: January 2013

Meeting:
17-22 February 2013

Miselis, J. L., U.S. Geological Survey, USA, jmiselis@usgs.gov
Kindinger, J. L., U.S. Geological Survey, USA, jkindinger@usgs.gov
Buster, N. A., U.S. Geological Survey, USA, nbuster@usgs.gov

REFINING THE LINK BETWEEN THE HOLOCENE DEVELOPMENT OF THE MISSISSIPPI RIVER DELTA AND THE GEOLOGIC EVOLUTION OF CAT ISLAND, MS

Cat Island (CI) is the westernmost barrier island in a chain extending from Dauphin Island, AL, to the Pearl River, MS. The island’s unusual shape and multiple sets of beach ridges have led many researchers to speculate on its evolution, but uncertainty remains about the extent to which the mid-Holocene growth of the St. Bernard delta lobe (SBDL) of the Mississippi River influenced its history. This is partly due to the lack of comprehensive geological information offshore from the island. An extensive survey of CI and its surrounding waters, which utilized high-resolution geophysics, vibracores, and optically stimulated luminescence (OSL) and radiocarbon dating, provides stratigraphic control for CI evolution in relation to the SBDL. OSL results reveal ~6.0-4.6-ka sediments beneath the first two sets of beach ridges on the island, supporting the existence of an antecedent barrier platform that extended from Dauphin Island. The geophysical and sedimentologic data indicate the SBDL prograded northward to partially bury the barrier platform south of the present island location, helping to further refine the influence of the SBDL in the geologic history of CI.

Oral presentation

Session #:SS25
Date: 2/22/2013
Time: 10:45