New palaeoenvironmental and palaeoceanographical interpretations of the Miocene Wuk Wuk Marl and Bairnsdale Limestone using ostracod microfossils
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 environment...
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ftdeakinunifig:oai:figshare.com:article/21118360 2023-05-15T14:05:24+02:00 New palaeoenvironmental and palaeoceanographical interpretations of the Miocene Wuk Wuk Marl and Bairnsdale Limestone using ostracod microfossils Thomas Cacopardo 2021-01-01T00:00:00Z http://hdl.handle.net/10536/DRO/DU:30154674 https://figshare.com/articles/thesis/New_palaeoenvironmental_and_palaeoceanographical_interpretations_of_the_Miocene_Wuk_Wuk_Marl_and_Bairnsdale_Limestone_using_ostracod_microfossils/21118360 unknown http://hdl.handle.net/10536/DRO/DU:30154674 https://figshare.com/articles/thesis/New_palaeoenvironmental_and_palaeoceanographical_interpretations_of_the_Miocene_Wuk_Wuk_Marl_and_Bairnsdale_Limestone_using_ostracod_microfossils/21118360 All Rights Reserved Uncategorized ostracoda palaeoenvironmental interpretations palaeoceanography antarctic circumpolar current miocene continental shelf Wuk Wuk Marl Bairnsdale limestone Text Thesis 2021 ftdeakinunifig 2022-11-17T18:34:24Z 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. Thesis Antarc* Antarctic DRO - Deakin Research Online Antarctic The Antarctic |
institution |
Open Polar |
collection |
DRO - Deakin Research Online |
op_collection_id |
ftdeakinunifig |
language |
unknown |
topic |
Uncategorized ostracoda palaeoenvironmental interpretations palaeoceanography antarctic circumpolar current miocene continental shelf Wuk Wuk Marl Bairnsdale limestone |
spellingShingle |
Uncategorized ostracoda palaeoenvironmental interpretations palaeoceanography antarctic circumpolar current miocene continental shelf Wuk Wuk Marl Bairnsdale limestone Thomas Cacopardo New palaeoenvironmental and palaeoceanographical interpretations of the Miocene Wuk Wuk Marl and Bairnsdale Limestone using ostracod microfossils |
topic_facet |
Uncategorized ostracoda palaeoenvironmental interpretations palaeoceanography antarctic circumpolar current miocene continental shelf Wuk Wuk Marl Bairnsdale limestone |
description |
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. |
format |
Thesis |
author |
Thomas Cacopardo |
author_facet |
Thomas Cacopardo |
author_sort |
Thomas Cacopardo |
title |
New palaeoenvironmental and palaeoceanographical interpretations of the Miocene Wuk Wuk Marl and Bairnsdale Limestone using ostracod microfossils |
title_short |
New palaeoenvironmental and palaeoceanographical interpretations of the Miocene Wuk Wuk Marl and Bairnsdale Limestone using ostracod microfossils |
title_full |
New palaeoenvironmental and palaeoceanographical interpretations of the Miocene Wuk Wuk Marl and Bairnsdale Limestone using ostracod microfossils |
title_fullStr |
New palaeoenvironmental and palaeoceanographical interpretations of the Miocene Wuk Wuk Marl and Bairnsdale Limestone using ostracod microfossils |
title_full_unstemmed |
New palaeoenvironmental and palaeoceanographical interpretations of the Miocene Wuk Wuk Marl and Bairnsdale Limestone using ostracod microfossils |
title_sort |
new palaeoenvironmental and palaeoceanographical interpretations of the miocene wuk wuk marl and bairnsdale limestone using ostracod microfossils |
publishDate |
2021 |
url |
http://hdl.handle.net/10536/DRO/DU:30154674 https://figshare.com/articles/thesis/New_palaeoenvironmental_and_palaeoceanographical_interpretations_of_the_Miocene_Wuk_Wuk_Marl_and_Bairnsdale_Limestone_using_ostracod_microfossils/21118360 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
http://hdl.handle.net/10536/DRO/DU:30154674 https://figshare.com/articles/thesis/New_palaeoenvironmental_and_palaeoceanographical_interpretations_of_the_Miocene_Wuk_Wuk_Marl_and_Bairnsdale_Limestone_using_ostracod_microfossils/21118360 |
op_rights |
All Rights Reserved |
_version_ |
1766277249033568256 |