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Geomorphic Evolution of a Holocene Beach-Ridge Complex, LeFevre Peninsula, South Australia
Greg Bowman and Nick Harvey
Journal of Coastal Research
Vol. 2, No. 3 (Summer, 1986), pp. 345-362
Published by: Coastal Education & Research Foundation, Inc.
Stable URL: http://www.jstor.org/stable/4297197
Page Count: 18
You can always find the topics here!Topics: Peninsulas, Sediments, Sea level, Gulfs, Coasts, Radiocarbon dating, Geology, Radiocarbon, Lithofacies, Sand
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Intensive drilling and radiocarbon dating are used to interpret the Holocene evolution of LeFevre Peninsula, located on the eastern shore of Gulf St Vincent, South Australia. This beach-ridge complex is in a low to medium energy environment where longshore sediment drift is dominant Sedimentation commenced at the end of the Postglacial Marine Transgression around 7,500 calendar yrs BP, indicating a similar sea level history to east Australian coastal barriers. A major sediment pulse between 7,500 and 5,500 yrs BP produced a rapid northward progradation of the regressive lithofacies. After 5,500 yrs a reduced rate of sediment supply and a change in coastline orientation contributed to spit recurvature and a flared beach- ridge pattern. The longshore spit progradation and shore parallel backbarrier facies of LeFevre Peninsula contrast with the shore-normal development of east Australian barriers which tend to block bedrock embayments and constrain backbarrier sedimentation.
Journal of Coastal Research © 1986 Coastal Education & Research Foundation, Inc.