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Late Quaternary Evolution of Coastal Sand Barriers, Port Stephens-Myall Lakes Area, Central New South Wales, Australia

Published online by Cambridge University Press:  20 January 2017

B.G. Thom ,
G.M. Bowman  and
P.S. Roy
B.G. Thom
Affiliation:
Department of Geography, Faculty of Military Studies, University of New South Wales, Duntroon, Australia
G.M. Bowman
Affiliation:
Department of Geography, Faculty of Military Studies, University of New South Wales, Duntroon, Australia
P.S. Roy
Affiliation:
Geological Survey of New South Wales, Department of Mineral Resources, Sydney, Australia
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Abstract

The geomorphic and stratigraphic history of six coastal embayments has been studied in the vicinity of Newcastle, New South Wales (N.S.W.), Australia, in order to determine modes of deposition, and the degree to which marine and estuarine deposits can be correlated and dated. Each embayment possesses its own distinctive suite of landforms ranging from those dominated by coastal dunes to those in which beach ridges occur. In four of the bays dual sand barriers, comprising an Inner Barrier and an Outer Barrier, provide the framework for correlation between embayments. Six stages are recognized in the deposition of late Quaternary sediments in this area: (i) Pre-Last Interglacial, involving accumulation of separate composite units consisting of estuarine clays and transgressive dune complexes; (ii) Last Interglacial stage during which Inner Barriers were formed; (iii) Last Glacial reworking of barrier and dune sands by westerly winds; (iv) Postglacial Marine Transgression during which the Outer Barriers were initiated; (v) Mid-Holocene stage following cessation of sea-level rise ca. 6000–6500 yr B.P. on this coast, and involving progradation of Outer Barriers in some embayments; and (vi) Late Holocene episodic eolian reworking of dune complexes and Outer Barriers. The relatively high wave and wind energy as well as the tectonic setting of the central N.S.W. coast results in somewhat different geomorphic histories from barrier-island coasts in North America and Europe.

Type
Research Article
Information
Quaternary Research , Volume 15 , Issue 3 , May 1981 , pp. 345 - 364
Copyright
University of Washington

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