Biostratigraphy and Systematics of Cambrian Small Shelly Fossils from East Antarctica and South Australia
The remote lower Cambrian Byrd group of sedimentary rocks from East Antarctica has been studied intermittently since its discovery over a century ago. Previous insights into the trilobites and archaeocyaths indicated a close correlation to the sedimentary sequences of South Australia. The lowest uni...
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Uppsala universitet, Paleobiologi
2021
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ftuppsalauniv:oai:DiVA.org:uu-405216 2023-05-15T13:44:12+02:00 Biostratigraphy and Systematics of Cambrian Small Shelly Fossils from East Antarctica and South Australia Claybourn, Thomas M. 2021 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-405216 eng eng Uppsala universitet, Paleobiologi Macquarie University Uppsala Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, 1651-6214 1907 http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-405216 urn:isbn:978-91-513-0880-7 info:eu-repo/semantics/openAccess Cambrian Biostratigraphy Systematics East Antarctica Small Shelly Fossils Other Earth and Related Environmental Sciences Annan geovetenskap och miljövetenskap Doctoral thesis, comprehensive summary info:eu-repo/semantics/doctoralThesis text 2021 ftuppsalauniv 2023-02-23T21:54:55Z The remote lower Cambrian Byrd group of sedimentary rocks from East Antarctica has been studied intermittently since its discovery over a century ago. Previous insights into the trilobites and archaeocyaths indicated a close correlation to the sedimentary sequences of South Australia. The lowest unit of the Byrd Group is the fossiliferous Shackleton Limestone which overlies the Neoproterozoic metamorphic rocks of the Beardmore Group and is representative of a long period of carbonate shelf formation on a passive margin with the palaeo-Pacific. This was truncated by marine transgression and the deposition of the deeper-water calcareous siltstones of the fossiliferous Holyoake Formation. This is overlain by the Starshot Formation and all three units are cross-cut by the Douglas Conglomerate, marking the start of a collisional tectonic regime between the East Gondwana and palaeo-Pacific plates. The first systematically sampled and analysed sections through the carbonate Shackleton Limestone and argillaceous Holyoake Formation has yielded a new fauna of small primarily phosphatic and secondarily phosphatised shelly fossils. The abundant molluscs, brachiopods and tommotiids are reported here. These findings are ideal for correlating this section to the fossil biozones of South Australia, including the Dailyatia odyssei small shelly fossil Zone and the Pararaia janeae trilobite Zone. Chemostratigraphic data from three sections preserve the profiles of two major stable carbon isotope excursions: the Mingxinsi Carbon Isotope Excursion and the Archaeocyathid Extinction Carbon isotope Excursion. The combination of these two lines of evidence are a strong indicator for Cambrian Series 2, early-mid Stage 4. This is corroborated by newly described D. odyssei-P. janeae Zone small shelly fossils from the carbonate clasts from the Cambrian Stage 4 White Point Conglomerate of South Australia which bear strong similarity to the fauna of the Shackleton Limestone. Palaeobiogeographically the fauna recovered from the Byrd Group is ... Doctoral or Postdoctoral Thesis Antarc* Antarctica East Antarctica Uppsala University: Publications (DiVA) Beardmore ENVELOPE(174.900,174.900,-83.350,-83.350) Byrd East Antarctica Pacific Shackleton White Point ENVELOPE(-56.582,-56.582,49.833,49.833) |
institution |
Open Polar |
collection |
Uppsala University: Publications (DiVA) |
op_collection_id |
ftuppsalauniv |
language |
English |
topic |
Cambrian Biostratigraphy Systematics East Antarctica Small Shelly Fossils Other Earth and Related Environmental Sciences Annan geovetenskap och miljövetenskap |
spellingShingle |
Cambrian Biostratigraphy Systematics East Antarctica Small Shelly Fossils Other Earth and Related Environmental Sciences Annan geovetenskap och miljövetenskap Claybourn, Thomas M. Biostratigraphy and Systematics of Cambrian Small Shelly Fossils from East Antarctica and South Australia |
topic_facet |
Cambrian Biostratigraphy Systematics East Antarctica Small Shelly Fossils Other Earth and Related Environmental Sciences Annan geovetenskap och miljövetenskap |
description |
The remote lower Cambrian Byrd group of sedimentary rocks from East Antarctica has been studied intermittently since its discovery over a century ago. Previous insights into the trilobites and archaeocyaths indicated a close correlation to the sedimentary sequences of South Australia. The lowest unit of the Byrd Group is the fossiliferous Shackleton Limestone which overlies the Neoproterozoic metamorphic rocks of the Beardmore Group and is representative of a long period of carbonate shelf formation on a passive margin with the palaeo-Pacific. This was truncated by marine transgression and the deposition of the deeper-water calcareous siltstones of the fossiliferous Holyoake Formation. This is overlain by the Starshot Formation and all three units are cross-cut by the Douglas Conglomerate, marking the start of a collisional tectonic regime between the East Gondwana and palaeo-Pacific plates. The first systematically sampled and analysed sections through the carbonate Shackleton Limestone and argillaceous Holyoake Formation has yielded a new fauna of small primarily phosphatic and secondarily phosphatised shelly fossils. The abundant molluscs, brachiopods and tommotiids are reported here. These findings are ideal for correlating this section to the fossil biozones of South Australia, including the Dailyatia odyssei small shelly fossil Zone and the Pararaia janeae trilobite Zone. Chemostratigraphic data from three sections preserve the profiles of two major stable carbon isotope excursions: the Mingxinsi Carbon Isotope Excursion and the Archaeocyathid Extinction Carbon isotope Excursion. The combination of these two lines of evidence are a strong indicator for Cambrian Series 2, early-mid Stage 4. This is corroborated by newly described D. odyssei-P. janeae Zone small shelly fossils from the carbonate clasts from the Cambrian Stage 4 White Point Conglomerate of South Australia which bear strong similarity to the fauna of the Shackleton Limestone. Palaeobiogeographically the fauna recovered from the Byrd Group is ... |
format |
Doctoral or Postdoctoral Thesis |
author |
Claybourn, Thomas M. |
author_facet |
Claybourn, Thomas M. |
author_sort |
Claybourn, Thomas M. |
title |
Biostratigraphy and Systematics of Cambrian Small Shelly Fossils from East Antarctica and South Australia |
title_short |
Biostratigraphy and Systematics of Cambrian Small Shelly Fossils from East Antarctica and South Australia |
title_full |
Biostratigraphy and Systematics of Cambrian Small Shelly Fossils from East Antarctica and South Australia |
title_fullStr |
Biostratigraphy and Systematics of Cambrian Small Shelly Fossils from East Antarctica and South Australia |
title_full_unstemmed |
Biostratigraphy and Systematics of Cambrian Small Shelly Fossils from East Antarctica and South Australia |
title_sort |
biostratigraphy and systematics of cambrian small shelly fossils from east antarctica and south australia |
publisher |
Uppsala universitet, Paleobiologi |
publishDate |
2021 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-405216 |
long_lat |
ENVELOPE(174.900,174.900,-83.350,-83.350) ENVELOPE(-56.582,-56.582,49.833,49.833) |
geographic |
Beardmore Byrd East Antarctica Pacific Shackleton White Point |
geographic_facet |
Beardmore Byrd East Antarctica Pacific Shackleton White Point |
genre |
Antarc* Antarctica East Antarctica |
genre_facet |
Antarc* Antarctica East Antarctica |
op_relation |
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, 1651-6214 1907 http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-405216 urn:isbn:978-91-513-0880-7 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1766198785244921856 |