An Early Cambrian archaeocyath–trilobite fauna in limestone erratics from the Upper Carboniferous Fitzroy Tillite Formation, Falkland Islands
Rare clasts of limestone contained in the uppermost Carboniferous Fitzroy Tillite Formation of the Falkland Islands contain a rich Cambrian fauna of archaeocyaths together with a radiocyath and a few trilobites. Neither Cambrian strata nor limestone are present in the indigenous rock succession and...
Published in: | Earth and Environmental Science Transactions of the Royal Society of Edinburgh |
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Cambridge University Press
2012
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Online Access: | http://nora.nerc.ac.uk/id/eprint/500150/ https://nora.nerc.ac.uk/id/eprint/500150/1/TR1005%20-%20RevisedText-June2012.pdf https://doi.org/10.1017/S175569101101005X |
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ftnerc:oai:nora.nerc.ac.uk:500150 2023-05-15T13:48:07+02:00 An Early Cambrian archaeocyath–trilobite fauna in limestone erratics from the Upper Carboniferous Fitzroy Tillite Formation, Falkland Islands Stone, P. Thomson, M.R.A. Rushton, A.W.A. 2012 text http://nora.nerc.ac.uk/id/eprint/500150/ https://nora.nerc.ac.uk/id/eprint/500150/1/TR1005%20-%20RevisedText-June2012.pdf https://doi.org/10.1017/S175569101101005X en eng Cambridge University Press https://nora.nerc.ac.uk/id/eprint/500150/1/TR1005%20-%20RevisedText-June2012.pdf Stone, P.; Thomson, M.R.A.; Rushton, A.W.A. 2012 An Early Cambrian archaeocyath–trilobite fauna in limestone erratics from the Upper Carboniferous Fitzroy Tillite Formation, Falkland Islands. Earth and Environmental Science Transactions of the Royal Society of Edinburgh, 102 (04). 201-225. https://doi.org/10.1017/S175569101101005X <https://doi.org/10.1017/S175569101101005X> Publication - Article PeerReviewed 2012 ftnerc https://doi.org/10.1017/S175569101101005X 2023-02-04T19:36:13Z Rare clasts of limestone contained in the uppermost Carboniferous Fitzroy Tillite Formation of the Falkland Islands contain a rich Cambrian fauna of archaeocyaths together with a radiocyath and a few trilobites. Neither Cambrian strata nor limestone are present in the indigenous rock succession and the clasts are regarded as exotic erratics, introduced during the Permo-Carboniferous glaciation of southern Gondwana, prior to its Mesozoic break-up. Nineteen archaeocyath taxa have been identified, with seven (plus a radiocyath) occurring in a single clast. Trilobite identifications are less definitive, but they are compared to Yorkella and the Siberian genera Edelsteinaspis, Namanoia and Chondrinouyina. The archaeocyath fauna has an Australo–Antarctic character and the Transantarctic Mountains seem the most likely source for these unusual erratics. Most recent reconstructions of Gondwana rotate a Falklands microplate into a position between South Africa and East Antarctica. There, it is in proximity with the Eastern Cape Province, where tillites within the Permo-Carboniferous Dwyka Group are correlatives of the Fitzroy Tillite Formation, and the ‘Atlantic’ end of the Transantarctic Mountains. The Dwyka Group tillites also contain rare clasts of archaeocyathan limestone and the rotational reconstruction produces a continuity of the apparent ice-flow directions in South Africa and the Falkland Islands. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Natural Environment Research Council: NERC Open Research Archive Antarctic East Antarctica Transantarctic Mountains Fitzroy ENVELOPE(-66.964,-66.964,-68.189,-68.189) Earth and Environmental Science Transactions of the Royal Society of Edinburgh 102 4 201 225 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
Rare clasts of limestone contained in the uppermost Carboniferous Fitzroy Tillite Formation of the Falkland Islands contain a rich Cambrian fauna of archaeocyaths together with a radiocyath and a few trilobites. Neither Cambrian strata nor limestone are present in the indigenous rock succession and the clasts are regarded as exotic erratics, introduced during the Permo-Carboniferous glaciation of southern Gondwana, prior to its Mesozoic break-up. Nineteen archaeocyath taxa have been identified, with seven (plus a radiocyath) occurring in a single clast. Trilobite identifications are less definitive, but they are compared to Yorkella and the Siberian genera Edelsteinaspis, Namanoia and Chondrinouyina. The archaeocyath fauna has an Australo–Antarctic character and the Transantarctic Mountains seem the most likely source for these unusual erratics. Most recent reconstructions of Gondwana rotate a Falklands microplate into a position between South Africa and East Antarctica. There, it is in proximity with the Eastern Cape Province, where tillites within the Permo-Carboniferous Dwyka Group are correlatives of the Fitzroy Tillite Formation, and the ‘Atlantic’ end of the Transantarctic Mountains. The Dwyka Group tillites also contain rare clasts of archaeocyathan limestone and the rotational reconstruction produces a continuity of the apparent ice-flow directions in South Africa and the Falkland Islands. |
format |
Article in Journal/Newspaper |
author |
Stone, P. Thomson, M.R.A. Rushton, A.W.A. |
spellingShingle |
Stone, P. Thomson, M.R.A. Rushton, A.W.A. An Early Cambrian archaeocyath–trilobite fauna in limestone erratics from the Upper Carboniferous Fitzroy Tillite Formation, Falkland Islands |
author_facet |
Stone, P. Thomson, M.R.A. Rushton, A.W.A. |
author_sort |
Stone, P. |
title |
An Early Cambrian archaeocyath–trilobite fauna in limestone erratics from the Upper Carboniferous Fitzroy Tillite Formation, Falkland Islands |
title_short |
An Early Cambrian archaeocyath–trilobite fauna in limestone erratics from the Upper Carboniferous Fitzroy Tillite Formation, Falkland Islands |
title_full |
An Early Cambrian archaeocyath–trilobite fauna in limestone erratics from the Upper Carboniferous Fitzroy Tillite Formation, Falkland Islands |
title_fullStr |
An Early Cambrian archaeocyath–trilobite fauna in limestone erratics from the Upper Carboniferous Fitzroy Tillite Formation, Falkland Islands |
title_full_unstemmed |
An Early Cambrian archaeocyath–trilobite fauna in limestone erratics from the Upper Carboniferous Fitzroy Tillite Formation, Falkland Islands |
title_sort |
early cambrian archaeocyath–trilobite fauna in limestone erratics from the upper carboniferous fitzroy tillite formation, falkland islands |
publisher |
Cambridge University Press |
publishDate |
2012 |
url |
http://nora.nerc.ac.uk/id/eprint/500150/ https://nora.nerc.ac.uk/id/eprint/500150/1/TR1005%20-%20RevisedText-June2012.pdf https://doi.org/10.1017/S175569101101005X |
long_lat |
ENVELOPE(-66.964,-66.964,-68.189,-68.189) |
geographic |
Antarctic East Antarctica Transantarctic Mountains Fitzroy |
geographic_facet |
Antarctic East Antarctica Transantarctic Mountains Fitzroy |
genre |
Antarc* Antarctic Antarctica East Antarctica |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica |
op_relation |
https://nora.nerc.ac.uk/id/eprint/500150/1/TR1005%20-%20RevisedText-June2012.pdf Stone, P.; Thomson, M.R.A.; Rushton, A.W.A. 2012 An Early Cambrian archaeocyath–trilobite fauna in limestone erratics from the Upper Carboniferous Fitzroy Tillite Formation, Falkland Islands. Earth and Environmental Science Transactions of the Royal Society of Edinburgh, 102 (04). 201-225. https://doi.org/10.1017/S175569101101005X <https://doi.org/10.1017/S175569101101005X> |
op_doi |
https://doi.org/10.1017/S175569101101005X |
container_title |
Earth and Environmental Science Transactions of the Royal Society of Edinburgh |
container_volume |
102 |
container_issue |
4 |
container_start_page |
201 |
op_container_end_page |
225 |
_version_ |
1766248629282013184 |