A chenier sequence at Broad Sound,Queensland, and evidence against a Holocene high sea level |
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| Authors: | PJ Cook HA Polach |
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| Institution: | 1. Bureau of Mineral Resources, Canberra, A.C.T. Australia;2. Australian National University, Canberra, A.C.T. Australia |
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| Abstract: | A prograding chenier plain on the west side of Broad Sound is up to 5 km wide and individual beach ridges (cheniers) are up to 5 km long. The cheniers are believed to have formed during periods of low sediment supply, leading to the erosion of mangrove deposits and the attendant development of a beach ridge. Radiocarbon dating of two sequences, revealed that cheniers formed at about 5000, 4500, 3550, 2500, 1600 and 700 years B.P. There is no significant change in the elevation of the cheniers during this 5000 year interval and it would seem from the Broad Sound evidence that sea level stabilized at about the present level approximately 5000 years B.P. Since that time mean sea level has varied by no more than ± 1 m. |
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