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Geological Society, London, Special Publications; 1998; v. 146; p. 255-267;
DOI: 10.1144/GSL.SP.1999.146.01.15
© 1998 Geological Society of London

Quaternary neotectonism and intra-plate volcanism: the Coorong to Mount Gambier Coastal Plain, southeastern Australia: a review

C. V. Murray-Wallace1, A. P. Belperio2 & J. H. Cann3

1 School of Geosciences, University of Wollongong, N.S.W., 2522, Australia colin_murray-wallace{at}uow.edu.au
2 Minotaur Gold, 1a Gladstone Street, Fullarton, S.A., 5063, Australia
3 School of Engineering (Applied Geology), University of South Australia, The Levels Campus, S.A., 5095, Australia

The Coorong to Mount Gambier Coastal Plain in southeastern South Australia preserves a lengthy record of Quaternary temperate carbonate sedimentation in the form of high wave energy barrier shoreline deposits and associated back-barrier lagoon facies. The barriers occur sub-parallel to the modern coastline and to each other and increase in age landwards. The age of the barriers is now generally well established within a framework of radiocarbon, thermoluminescence, uranium-series disequilibrium, amino acid racemization dating and the position of the Brunhes-Matuyama boundary between the East and West Naracoorte Ranges. This framework is in accord with the deep-sea {delta}18O record of global ice volume change and the inferred timing of sea-level highstands for this interval. Individual barriers such as the last interglacial Woakwine Range (oxygen-isotope substage 5e) may be traced laterally for distances up to 300km and record a history of neotectonism in the form of regionally varying epeirogenic uplift associated with Quaternary volcanism.