Early Cambrian archaeocyathan limestone blocks in low-grade meta-conglomerate from El Jagüelito Formation (Sierra Grande, Río Negro, Argentina)
Massive grey limestone blocks containing a fairly diverse but poorly preserved archaeocyath fauna were recovered from a meta-conglomerate bed in the El Jagüelito Formation (Sierra Grande area, Eastern North Patagonian Massif, Río Negro, Argentina). This is the first documented reference of the prese...
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ftraco:oai:raco.cat:article/244266 2023-05-15T13:53:49+02:00 Early Cambrian archaeocyathan limestone blocks in low-grade meta-conglomerate from El Jagüelito Formation (Sierra Grande, Río Negro, Argentina) González, P. D. Tortello, M. F. Damborenea, Susana E. 2011-07-14 application/pdf http://www.raco.cat/index.php/GeologicaActa/article/view/244266 eng eng Universitat de Barcelona L'accés als articles a text complet inclosos a RACO és gratuït, però els actes de reproducció, distribució, comunicació pública o transformació total o parcial estan subjectes a les condicions d'ús de cada revista i poden requerir el consentiment exprés i escrit dels autors i/o institucions editores. Geologica Acta; Vol.: 9 Núm.: 2 Peer-reviewed Article 2011 ftraco 2011-07-19T23:28:13Z Massive grey limestone blocks containing a fairly diverse but poorly preserved archaeocyath fauna were recovered from a meta-conglomerate bed in the El Jagüelito Formation (Sierra Grande area, Eastern North Patagonian Massif, Río Negro, Argentina). This is the first documented reference of the presence of archaeocyaths in continental Argentina. Seven different taxa were identified, preliminary described and figured. Recrystallization of the skeletons due to regional low-grade metamorphism and deformation of the unit does not allow observation of key detailed features and prevents identification to genera and species. Nevertheless, the specimens studied show general affinities with archaeocyathan assemblages from the Australia-Antarctica palaeobiogeographic province and indicate a middle Early Cambrian (Atdabanian-Botomian) maximum age for the deposition of the El Jagüelito Formation protoliths. The similarities between the North Patagonian Early Paleozoic El Jagüelito Formation and those rocks from Antarctica suggest a geologic and biologic common history of these regions on the same southwest margin of Gondwana during that time. Article in Journal/Newspaper Antarc* Antarctica RACO: Revistes Catalanes amb Accés Obert Argentina |
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Open Polar |
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RACO: Revistes Catalanes amb Accés Obert |
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ftraco |
language |
English |
description |
Massive grey limestone blocks containing a fairly diverse but poorly preserved archaeocyath fauna were recovered from a meta-conglomerate bed in the El Jagüelito Formation (Sierra Grande area, Eastern North Patagonian Massif, Río Negro, Argentina). This is the first documented reference of the presence of archaeocyaths in continental Argentina. Seven different taxa were identified, preliminary described and figured. Recrystallization of the skeletons due to regional low-grade metamorphism and deformation of the unit does not allow observation of key detailed features and prevents identification to genera and species. Nevertheless, the specimens studied show general affinities with archaeocyathan assemblages from the Australia-Antarctica palaeobiogeographic province and indicate a middle Early Cambrian (Atdabanian-Botomian) maximum age for the deposition of the El Jagüelito Formation protoliths. The similarities between the North Patagonian Early Paleozoic El Jagüelito Formation and those rocks from Antarctica suggest a geologic and biologic common history of these regions on the same southwest margin of Gondwana during that time. |
format |
Article in Journal/Newspaper |
author |
González, P. D. Tortello, M. F. Damborenea, Susana E. |
spellingShingle |
González, P. D. Tortello, M. F. Damborenea, Susana E. Early Cambrian archaeocyathan limestone blocks in low-grade meta-conglomerate from El Jagüelito Formation (Sierra Grande, Río Negro, Argentina) |
author_facet |
González, P. D. Tortello, M. F. Damborenea, Susana E. |
author_sort |
González, P. D. |
title |
Early Cambrian archaeocyathan limestone blocks in low-grade meta-conglomerate from El Jagüelito Formation (Sierra Grande, Río Negro, Argentina) |
title_short |
Early Cambrian archaeocyathan limestone blocks in low-grade meta-conglomerate from El Jagüelito Formation (Sierra Grande, Río Negro, Argentina) |
title_full |
Early Cambrian archaeocyathan limestone blocks in low-grade meta-conglomerate from El Jagüelito Formation (Sierra Grande, Río Negro, Argentina) |
title_fullStr |
Early Cambrian archaeocyathan limestone blocks in low-grade meta-conglomerate from El Jagüelito Formation (Sierra Grande, Río Negro, Argentina) |
title_full_unstemmed |
Early Cambrian archaeocyathan limestone blocks in low-grade meta-conglomerate from El Jagüelito Formation (Sierra Grande, Río Negro, Argentina) |
title_sort |
early cambrian archaeocyathan limestone blocks in low-grade meta-conglomerate from el jagüelito formation (sierra grande, río negro, argentina) |
publisher |
Universitat de Barcelona |
publishDate |
2011 |
url |
http://www.raco.cat/index.php/GeologicaActa/article/view/244266 |
geographic |
Argentina |
geographic_facet |
Argentina |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
Geologica Acta; Vol.: 9 Núm.: 2 |
op_rights |
L'accés als articles a text complet inclosos a RACO és gratuït, però els actes de reproducció, distribució, comunicació pública o transformació total o parcial estan subjectes a les condicions d'ús de cada revista i poden requerir el consentiment exprés i escrit dels autors i/o institucions editores. |
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1766259283498893312 |