Early Cambrian archaeocyathan limestone blocks in low-grade meta-conglomerate from El Jagüelito Formation (Sierra Grande, Río Negro, Argentina)

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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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Detalles Bibliográficos
Autores principales: González, Pablo Diego, Tortello, Marcelo Franco, Damborenea, Susana Ester
Formato: Articulo
Lenguaje:Inglés
Publicado: 2011
Materias:
Geología
Archaeocyatha
Early Cambrian
El Jagüelito Formation
Low-grade metamorphism
North Patagonian Massif
Argentina
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/114698
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-114698
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Geología
Archaeocyatha
Early Cambrian
El Jagüelito Formation
Low-grade metamorphism
North Patagonian Massif
Argentina
spellingShingle Geología
Archaeocyatha
Early Cambrian
El Jagüelito Formation
Low-grade metamorphism
North Patagonian Massif
Argentina
González, Pablo Diego
Tortello, Marcelo Franco
Damborenea, Susana Ester
Early Cambrian archaeocyathan limestone blocks in low-grade meta-conglomerate from El Jagüelito Formation (Sierra Grande, Río Negro, Argentina)
topic_facet Geología
Archaeocyatha
Early Cambrian
El Jagüelito Formation
Low-grade metamorphism
North Patagonian Massif
Argentina
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 Articulo
Articulo
author González, Pablo Diego
Tortello, Marcelo Franco
Damborenea, Susana Ester
author_facet González, Pablo Diego
Tortello, Marcelo Franco
Damborenea, Susana Ester
author_sort González, Pablo Diego
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)
publishDate 2011
url http://sedici.unlp.edu.ar/handle/10915/114698
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