Hettangian and Sinemurian (Lower Jurassic) biostratigraphy of Argentina

On the northern bank of the Rio Atuel, Mendeza province, Argentina, the marine fossilfferous Mesozoic is now known to begin with Hettangian-lower Sinemurian strata. Traditionally, the marine Jurassic sequence in the area was believed to start with upper Sinemurian levels. Representatives of the gene...

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Autores principales: Riccardi, Alberto Carlos, Damborenea, Susana Ester, Manceñido, Miguel Oscar, Ballent, Sara Cristina
Formato: Articulo
Lenguaje:Inglés
Publicado: 1991
Materias:
Ciencias Naturales
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/153009
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SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-153009
record_format dspace
spelling I19-R120-10915-1530092023-05-16T04:08:02Z http://sedici.unlp.edu.ar/handle/10915/153009 issn:0895-9811 Hettangian and Sinemurian (Lower Jurassic) biostratigraphy of Argentina Riccardi, Alberto Carlos Damborenea, Susana Ester Manceñido, Miguel Oscar Ballent, Sara Cristina 1991 2023-05-15T17:14:24Z en Ciencias Naturales On the northern bank of the Rio Atuel, Mendeza province, Argentina, the marine fossilfferous Mesozoic is now known to begin with Hettangian-lower Sinemurian strata. Traditionally, the marine Jurassic sequence in the area was believed to start with upper Sinemurian levels. Representatives of the genera Psiloceras Hyatt, Caloceras Hyatt, Alsatites Haug, Waehneroceras Hyatt, Schlotheimia Bayle, Sulciferites Spath, Badouxia Guex and Taylor, Vermiceras Hyatt, Coroniceras Hyatt, Agassiceras Hyatt, Euagassiceras Spath, and Arnioceras Hyatt thus indicate the presence of beds equivalent to the Planorbis, Liasieus, Angulata, Bucklandi, Semicostatum, and Turneri zones of the standard international chronostratigraphic scale. Hence, in Argentina, the marine Hettangian, Sinemurian, and lowermost Pliensbachian have been proved only in the neighborhood of the Rio Atuel region, where marine Triassic could also be represented. Elsewhere in Argentina, the oldest Jurassic ammonite-bearing levels usually belong to the upper lower or the upper Pliensbachian. Regionally, these findings imply a substantial modification to previous paleogeographic reconstructions for the Early Jurassic of South America. En la margen norte del rio Atuel, Mendoza, Argentina, la sucesi6n fosilifera marina del Mesozoieo comienza con niveles del Hettangiano y Sinemuriano inferior. Tradicionalmente se habia considerado queen la regi6n el Jur~sico marino comenzaba con el Sinemuriano superior. Representantes de los g~neros Psiloceras Hyatt, Caloceras Hyatt, Alsatites Haug, Waehneroceras Hyatt, Schlotheimia Bayle, Sulciferites Spath, Badouxia Guex y Taylor, Vermiceras Hyatt, Coroniceras Hyatt, Agassiceras Hyatt, Euagassieeras Spath y Arnioceras Hyatt, indican la presencia de estratos equivalentes alas zonas de Planorhis, Liasieus, Angulata, Bucklandi, Semicostatum y Turneri de la Escala Cronoestratigrafica Internacional. Asi en Argentina el Hettangiano, Sinemuriano, y Pliensbachiano basal marinos solamente han sido comprobados en proximidades de la regi6n del rio Atuel, donde tambi~n podrian hallarse representados niveles de Tri~sico marino. En el resto de Argentina los niveles m~s antiguos portadores de amonites del Jur~isico corresponden generalmente al Pliensbachiano inferior alto o Pliensbachiano superior. Desde el punto de vista regional estos hallazgos determinan una modificaci6n substancial en la paleogeografia del Jur~sico temprano de America del Sur. Facultad de Ciencias Naturales y Museo Articulo Articulo http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International (CC BY 4.0) application/pdf 159-170
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Naturales
spellingShingle Ciencias Naturales
Riccardi, Alberto Carlos
Damborenea, Susana Ester
Manceñido, Miguel Oscar
Ballent, Sara Cristina
Hettangian and Sinemurian (Lower Jurassic) biostratigraphy of Argentina
topic_facet Ciencias Naturales
description On the northern bank of the Rio Atuel, Mendeza province, Argentina, the marine fossilfferous Mesozoic is now known to begin with Hettangian-lower Sinemurian strata. Traditionally, the marine Jurassic sequence in the area was believed to start with upper Sinemurian levels. Representatives of the genera Psiloceras Hyatt, Caloceras Hyatt, Alsatites Haug, Waehneroceras Hyatt, Schlotheimia Bayle, Sulciferites Spath, Badouxia Guex and Taylor, Vermiceras Hyatt, Coroniceras Hyatt, Agassiceras Hyatt, Euagassiceras Spath, and Arnioceras Hyatt thus indicate the presence of beds equivalent to the Planorbis, Liasieus, Angulata, Bucklandi, Semicostatum, and Turneri zones of the standard international chronostratigraphic scale. Hence, in Argentina, the marine Hettangian, Sinemurian, and lowermost Pliensbachian have been proved only in the neighborhood of the Rio Atuel region, where marine Triassic could also be represented. Elsewhere in Argentina, the oldest Jurassic ammonite-bearing levels usually belong to the upper lower or the upper Pliensbachian. Regionally, these findings imply a substantial modification to previous paleogeographic reconstructions for the Early Jurassic of South America.
format Articulo
Articulo
author Riccardi, Alberto Carlos
Damborenea, Susana Ester
Manceñido, Miguel Oscar
Ballent, Sara Cristina
author_facet Riccardi, Alberto Carlos
Damborenea, Susana Ester
Manceñido, Miguel Oscar
Ballent, Sara Cristina
author_sort Riccardi, Alberto Carlos
title Hettangian and Sinemurian (Lower Jurassic) biostratigraphy of Argentina
title_short Hettangian and Sinemurian (Lower Jurassic) biostratigraphy of Argentina
title_full Hettangian and Sinemurian (Lower Jurassic) biostratigraphy of Argentina
title_fullStr Hettangian and Sinemurian (Lower Jurassic) biostratigraphy of Argentina
title_full_unstemmed Hettangian and Sinemurian (Lower Jurassic) biostratigraphy of Argentina
title_sort hettangian and sinemurian (lower jurassic) biostratigraphy of argentina
publishDate 1991
url http://sedici.unlp.edu.ar/handle/10915/153009
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