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Southeastern Section - 58th Annual Meeting (12-13 March 2009)

Paper No. 6
Presentation Time: 1:30 PM-5:30 PM

OPTICAL DATING OF THIRTEEN MILE BEACH RIDGE SEQUENCE NEAR APALACHICOLA, NORTHWESTERN FLORIDA, USA


BURDETTE, Kevin E.1, RINK, W. Jack2, MALLINSON, David J.3 and PARHAM, Peter R.3, (1)School of Geography and Earth Sciences, McMaster University, Hamilton, ON L8S 4K1, Canada, (2)School of Geography and Earth Sciences, McMaster University, 1280 Main St. West, Hamilton, ON L8S 4K1, Canada, (3)Department of Geological Sciences, East Carolina University, Greenville, NC 27858, burdetke@mcmaster.ca

Optically stimulated luminescence (OSL) samples from macrocores, ground penetrating radar (GPR) data, and lithologic data were acquired from a beach ridge sequence west of Apalachicola, in northwestern Florida, herein named for the first time as the 13 Mile Sequence. Four macrocores and GPR data were collected along a 2 km shore-normal transect. Ten OSL samples were collected from the macrocores to determine the depositional age of the beach ridge sequence. Several radar-facies were identified and correlated with lithofacies identified in the macrocores. The GPR data along with the lithologic data suggest that the ridges were formed by shoreface and dune building processes and are perched on an older shelly-sandy unit. The results of the OSL ages suggest the 13-Mile beach ridge sequence formed during the last interglacial, while the underlying shelly-sandy unit is slightly older, possibly marine isotope stage 7 or 9.

Session No. 20--Booth# 6

Coastal Geomorphology (Posters)
Friday, 13 March 2009: 1:30 PM-5:30 PM
Geological Society of America Abstracts with Programs. Vol. 41, No. 1, p.51
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