Abstract
Early to late Pliocene sedimentary strata present across the northern Bass Strait hinterland, southeastern Australia yield extensive fossil proxy data relevant to the interpretation of high sea level coastal palaeomorphology. Within the Pliocene Whalers Bluff Formation exposed in coastal cliffs near the township of Portland, Victoria, marine microfossil faunas delineate two broad cycles of deposition. Both these sedimentary cycles are bound below by unconformity surfaces. Within the lower sedimentary cycle, a basal stress-tolerant (low diversity) marginal marine microfossil fauna devoid of ostracods and suggestive of bottom-water hypoxia, is succeeded by a diverse shallow marine ostracod fauna dominated by stenohaline species indicative of a sheltered (but open) oceanic embayment. This lower sedimentary cycle has an early Pliocene (Zanclean) age. Equivalent shallow marine (e.g. coastal embayment) deposits occur broadly across the coastal hinterland of southeastern Australia—reflecting the generally higher global sea levels of this time. The upper cycle in the cliff exposures at Portland is late Pliocene (Piacenzian) in age. Equivalent deposits across the Bass Strait hinterland are restricted to former incised river valley settings. Euryhaline estuarine/coastal lagoon Ostracoda are present throughout the upper cycle in the Portland cliffs. These are associated with a low diversity microfauna at the base of the upper cycle and a high diversity microfauna towards the top of the cycle. Early Pliocene coastal marine deposits can be distinguished from late Pliocene coastal marine deposits across the northern Bass Strait hinterland on the basis of the presence or absence of certain open marine (‘stenohaline’) ostracod species.
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Acknowledgements
Dr Thomas Darragh is thanked for assistance with fossil molluscan identification and for providing information on molluscan ecology. Dr Gary Poore is thanked for access to Museum Victoria ostracod collections. Mark Warne thanks Deakin University for funding to attend the 16th International Symposium of Ostracoda, Brazil, where this article was initially presented. Deakin University is also thanked for access to laboratory facilities for the conduct of this research and for support via the “Environmental Sustainability” Faculty of Science and Technology Research Cluster. Three reviewers are thanked for their useful criticisms of the initial draft of this article.
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Guest editors: D. A. Dermeval, R. L. Pinto & K. Martens / Ostracoda – Biostratigraphy and Applied Ecology
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Warne, M.T., Soutar, B. Pliocene coastal palaeomorphology and ostracod faunas of the Bass Strait hinterland, southeast Australia. Hydrobiologia 688, 93–112 (2012). https://doi.org/10.1007/s10750-011-0777-2
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DOI: https://doi.org/10.1007/s10750-011-0777-2