Geomorphic evidence for mid-late Holocene higher sea level from southeastern Australia
Switzer, A.D. and Sloss, C.R. and Jones, B.G. and Bristow, Charlie S. (2010) Geomorphic evidence for mid-late Holocene higher sea level from southeastern Australia. Quaternary International 221 (1-2), pp. 13-22. ISSN 1040-6182.
An elevated sheltered pocket beach sequence at Batemans Bay, NSW, Australia, composed of shelly fine- to medium-grained sand provides geomorphic evidence of higher than present sea level during the mid-late Holocene. The sequence is composed of a sand facies with variable amounts of shell and contains a number of well-defined dipping reflectors identified in ground penetrating radar (GPR) profiles indicative of a small prograded beach system. This beach succession is overlain by storm or tsunami deposits. The beach deposit accumulated between 2500 and 5000 cal BP under relatively high energy conditions within a more open immature estuary during a period of higher sea level. Both deposits have been preserved by a low energy mangrove facies that accumulated after the recent fall in sea level cut off ocean wave activity from the area approximately 2000-2500 cal BP. This beach sequence provides new evidence for a period of higher sea level 1-1.5 m higher than present that lasted until at least c. 2000-2500 cal BP and adds complementary geomorphic evidence for the mid to late Holocene sea-level highstand previously identified along other parts of the southeast Australian coast using other methods.
|School:||Birkbeck Schools and Departments > School of Science > Earth and Planetary Sciences|
|Date Deposited:||15 Jun 2011 15:27|
|Last Modified:||17 Apr 2013 12:20|
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