New palaeoenvironmental and palaeoceanographical interpretations of the Miocene Wuk Wuk Marl and Bairnsdale Limestone using ostracod microfossils

Cacopardo, Thomas 2021, New palaeoenvironmental and palaeoceanographical interpretations of the Miocene Wuk Wuk Marl and Bairnsdale Limestone using ostracod microfossils, B. Science (Hons) thesis, School of Life and Environmental Sciences, Deakin University.

Attached Files
Name Description MIMEType Size Downloads

Title New palaeoenvironmental and palaeoceanographical interpretations of the Miocene Wuk Wuk Marl and Bairnsdale Limestone using ostracod microfossils
Author Cacopardo, Thomas
Institution Deakin University
School School of Life and Environmental Sciences
Faculty Faculty of Science, Engineering and Built Environment
Degree type Honours
Degree name B. Science (Hons)
Thesis advisor Warne, MarkORCID iD for Warne, Mark orcid.org/0000-0001-5456-191X
Date submitted 2021
Keyword(s) ostracoda
palaeoenvironmental interpretations
palaeoceanography
antarctic circumpolar current
miocene
continental shelf
Wuk Wuk Marl
Bairnsdale limestone
Summary For the first time, fossilised ostracod assemblages have been reported from the 9-7 million-year-old sedimentary rock layers known as the Upper Wuk Wuk Marl and Bairnsdale Limestone from Bairnsdale, Victoria. These layers represent stacked ancient seabeds, which yield information on past environments and oceanographic conditions. The assemblages provide data for new interpretations about early Late Miocene ancient continental shelf environments in the Gippsland region and ocean current circulation patterns. One key finding was the recognition of an earlier than previously thought influence of the Antarctic Circumpolar Current (ACC) on south eastern (SE) Australian marine realms.

About 600-750 ostracods were obtained each from two Upper Wuk Wuk Marl and two Bairnsdale Limestone samples from different Bairnsdale District rock exposures. The interpretations were made analysing ostracod assemblage comparative diversity, population age structures and fossil preservation characteristics, as well as through the consideration of abundant and/or ecologically significant taxa.

These fossil ostracod faunas gave new insights into the past continental shelf position of sampled sites, past local wave or current intensity, past (warmer) maritime conditions, and the past confluence of cool and warm water currents, as well as the likely past presence of seagrass meadows, and a weak coastal upwelling system. The occurrences of the Tasmanocypris dartnalli species group within these early Late Miocene outcrops provides evidence for an earlier than previously recorded influence of the ACC in southern Australia.
Language eng
Indigenous content off
Field of Research 3103 Ecology
Description of original 115 p.
Copyright notice ©All rights reserved
Free to Read? Yes
Persistent URL http://hdl.handle.net/10536/DRO/DU:30154674

Connect to link resolver
 
Unless expressly stated otherwise, the copyright for items in DRO is owned by the author, with all rights reserved.

Versions
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 0 times in TR Web of Science
Scopus Citation Count Cited 0 times in Scopus
Google Scholar Search Google Scholar
Access Statistics: 6 Abstract Views, 1 File Downloads  -  Detailed Statistics
Created: Fri, 20 Aug 2021, 09:35:08 EST by Bernadette Admin Houghton

Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO. If you believe that your rights have been infringed by this repository, please contact drosupport@deakin.edu.au.