Pliocene coastal palaeomorphology and ostracod faunas of the Bass Strait hinterland, southeast Australia

Warne, Mark T. and Soutar, Brent 2012, Pliocene coastal palaeomorphology and ostracod faunas of the Bass Strait hinterland, southeast Australia, Hydrobiologia, vol. 688, no. 1, pp. 93-112.

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Title Pliocene coastal palaeomorphology and ostracod faunas of the Bass Strait hinterland, southeast Australia
Author(s) Warne, Mark T.
Soutar, Brent
Journal name Hydrobiologia
Volume number 688
Issue number 1
Start page 93
End page 112
Total pages 20
Publisher Springer Netherlands
Place of publication Dordrecht, Netherlands
Publication date 2012
ISSN 0018-8158
1573-5117
Keyword(s) pliocene
ostracoda
Otway basin
stratigraphy
palaeoenvironments
palaeogeography
Summary 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.
Notes Published 22nd June 2011 as an Online First article
Language eng
Field of Research 040308 Palaeontology (incl Palynology)
040311 Stratigraphy (incl Biostratigraphy and Sequence Stratigraphy)
Socio Economic Objective 970104 Expanding Knowledge in the Earth Sciences
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2011, Springer Science+Business Media B.V.
Persistent URL http://hdl.handle.net/10536/DRO/DU:30040478

Document type: Journal Article
Collection: School of Life and Environmental Sciences
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