Archaeocyathan limestone blocks of likely Antarctic origin in Gondwanan tillite from the Falkland Islands
Cambrian limestone clasts containing a rich, well-preserved archaeocyathan fauna have been recovered from the late Carboniferous Fitzroy Tillite Formation of the Falkland Islands. Since neither Cambrian strata nor limestone are present anywhere in the indigenous rock succession, the clasts are regar...
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Geological Society of London
2005
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ftnerc:oai:nora.nerc.ac.uk:15836 2023-05-15T13:45:11+02:00 Archaeocyathan limestone blocks of likely Antarctic origin in Gondwanan tillite from the Falkland Islands Stone, P. Thomson, M.R.A. 2005 text http://nora.nerc.ac.uk/id/eprint/15836/ https://nora.nerc.ac.uk/id/eprint/15836/1/Archaeo-FinalText.pdf http://sp.lyellcollection.org/content/246/1 en eng Geological Society of London https://nora.nerc.ac.uk/id/eprint/15836/1/Archaeo-FinalText.pdf Stone, P.; Thomson, M.R.A. 2005 Archaeocyathan limestone blocks of likely Antarctic origin in Gondwanan tillite from the Falkland Islands. In: Terrane processes at the margins of Gondwana / edited by A.P.M. Vaughan, P.T. Leat and R.J. Pankhurst. London : Geological Society of London Special Publication 246. Geological Society of London, 347-357. (Geological Society Special Publications, 246). Publication - Book Section PeerReviewed 2005 ftnerc 2023-02-04T19:30:09Z Cambrian limestone clasts containing a rich, well-preserved archaeocyathan fauna have been recovered from the late Carboniferous Fitzroy Tillite Formation of the Falkland Islands. Since neither Cambrian strata nor limestone are present anywhere in the indigenous rock succession, the clasts are regarded as exotic erratics introduced during the Permo-Carboniferous Gondwana-wide glaciation. Most recent reconstructions of Gondwana rotate the Falklands into proximity with the Eastern Cape, South Africa and the Ellsworth Mountains, Antarctica. In both of these areas, Permo-Carboniferous diamictites correlated with the Fitzroy Tillite Formation also contain rare, exotic clasts of archaeocyathan limestone. The Transantarctic Mountains seem the most likely source for all of these unusual erratics. This interpretation sustains the requirement for substantial rotation of the Falklands microplate into Gondwana reconstructions and illustrates the extent of the late Carboniferous ice sheet. Apparent differences in the tillite clast assemblages between East and West Falkland suggest variable provenance within the regional ice-flow regime. Book Part Antarc* Antarctic Antarctica Ice Sheet Natural Environment Research Council: NERC Open Research Archive Antarctic Ellsworth Mountains ENVELOPE(-85.000,-85.000,-78.750,-78.750) Fitzroy ENVELOPE(-66.964,-66.964,-68.189,-68.189) Transantarctic Mountains |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
Cambrian limestone clasts containing a rich, well-preserved archaeocyathan fauna have been recovered from the late Carboniferous Fitzroy Tillite Formation of the Falkland Islands. Since neither Cambrian strata nor limestone are present anywhere in the indigenous rock succession, the clasts are regarded as exotic erratics introduced during the Permo-Carboniferous Gondwana-wide glaciation. Most recent reconstructions of Gondwana rotate the Falklands into proximity with the Eastern Cape, South Africa and the Ellsworth Mountains, Antarctica. In both of these areas, Permo-Carboniferous diamictites correlated with the Fitzroy Tillite Formation also contain rare, exotic clasts of archaeocyathan limestone. The Transantarctic Mountains seem the most likely source for all of these unusual erratics. This interpretation sustains the requirement for substantial rotation of the Falklands microplate into Gondwana reconstructions and illustrates the extent of the late Carboniferous ice sheet. Apparent differences in the tillite clast assemblages between East and West Falkland suggest variable provenance within the regional ice-flow regime. |
format |
Book Part |
author |
Stone, P. Thomson, M.R.A. |
spellingShingle |
Stone, P. Thomson, M.R.A. Archaeocyathan limestone blocks of likely Antarctic origin in Gondwanan tillite from the Falkland Islands |
author_facet |
Stone, P. Thomson, M.R.A. |
author_sort |
Stone, P. |
title |
Archaeocyathan limestone blocks of likely Antarctic origin in Gondwanan tillite from the Falkland Islands |
title_short |
Archaeocyathan limestone blocks of likely Antarctic origin in Gondwanan tillite from the Falkland Islands |
title_full |
Archaeocyathan limestone blocks of likely Antarctic origin in Gondwanan tillite from the Falkland Islands |
title_fullStr |
Archaeocyathan limestone blocks of likely Antarctic origin in Gondwanan tillite from the Falkland Islands |
title_full_unstemmed |
Archaeocyathan limestone blocks of likely Antarctic origin in Gondwanan tillite from the Falkland Islands |
title_sort |
archaeocyathan limestone blocks of likely antarctic origin in gondwanan tillite from the falkland islands |
publisher |
Geological Society of London |
publishDate |
2005 |
url |
http://nora.nerc.ac.uk/id/eprint/15836/ https://nora.nerc.ac.uk/id/eprint/15836/1/Archaeo-FinalText.pdf http://sp.lyellcollection.org/content/246/1 |
long_lat |
ENVELOPE(-85.000,-85.000,-78.750,-78.750) ENVELOPE(-66.964,-66.964,-68.189,-68.189) |
geographic |
Antarctic Ellsworth Mountains Fitzroy Transantarctic Mountains |
geographic_facet |
Antarctic Ellsworth Mountains Fitzroy Transantarctic Mountains |
genre |
Antarc* Antarctic Antarctica Ice Sheet |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet |
op_relation |
https://nora.nerc.ac.uk/id/eprint/15836/1/Archaeo-FinalText.pdf Stone, P.; Thomson, M.R.A. 2005 Archaeocyathan limestone blocks of likely Antarctic origin in Gondwanan tillite from the Falkland Islands. In: Terrane processes at the margins of Gondwana / edited by A.P.M. Vaughan, P.T. Leat and R.J. Pankhurst. London : Geological Society of London Special Publication 246. Geological Society of London, 347-357. (Geological Society Special Publications, 246). |
_version_ |
1766215973295095808 |