The Triassic-Jurassic boundary in the Andes of Argentina

The Arroyo Malo Formation at Alumbre Creek, on the northern bank of the Atuel River, west central Argentina, comprises a c. 300 m thick continuous marine succession across the Triassic-Jurassic System boundary, consisting of massive and laminated pelites indicative of a slope depositional environmen...

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Autores principales: Riccardi, Alberto Carlos, Damborenea, Susana Ester, Manceñido, Miguel Oscar, Iglesia Llanos, María Paula
Formato: Articulo
Lenguaje:Inglés
Publicado: 2004
Materias:
Geología
Ciencias Naturales
Biostratigraphy
Triassic Jurassic boundary
Argentina
Ammonoids
Bivalves
Brachiopods
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/97245
https://ri.conicet.gov.ar/11336/81386
https://riviste.unimi.it/index.php/RIPS/article/view/6266
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SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-97245
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Geología
Ciencias Naturales
Biostratigraphy
Triassic Jurassic boundary
Argentina
Ammonoids
Bivalves
Brachiopods
spellingShingle Geología
Ciencias Naturales
Biostratigraphy
Triassic Jurassic boundary
Argentina
Ammonoids
Bivalves
Brachiopods
Riccardi, Alberto Carlos
Damborenea, Susana Ester
Manceñido, Miguel Oscar
Iglesia Llanos, María Paula
The Triassic-Jurassic boundary in the Andes of Argentina
topic_facet Geología
Ciencias Naturales
Biostratigraphy
Triassic Jurassic boundary
Argentina
Ammonoids
Bivalves
Brachiopods
description The Arroyo Malo Formation at Alumbre Creek, on the northern bank of the Atuel River, west central Argentina, comprises a c. 300 m thick continuous marine succession across the Triassic-Jurassic System boundary, consisting of massive and laminated pelites indicative of a slope depositional environment. Late Triassic invertebrates, including ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals are restricted to the lower 150 m. Beds between 125-135 m from the bottom yield <em>Choristoceras</em> cf<em>. marshi</em> Hauer, a species found in the Marshi/Crickmayi Zone of Europe and North America, together with loose fragments of <em>Psiloceras</em> cf. <em>pressum</em> Hillebrandt, coeval with the lower to middle part of the Hettangian Planorbis Zone. About 80 m higher are beds yielding <em>Psiloceras</em> cf. <em>rectocostatum</em> Hillebrandt, a species that gives name to an Andean biozone partially coeval with the Johnstoni and Plicatulum Subzones, upper Planorbis Zone. Other fossils recorded in the Rhaetian strata of this section are foraminifers, ostracods and plant remains identified as <em>Zuberia</em> cf. <em>zuberi</em> (Szaj.) Freng. and <em>Clathropteris</em> sp. The section was also sampled for conodonts and radiolarians, thus far with negative results. A palaeomagnetic study is underway.
format Articulo
Articulo
author Riccardi, Alberto Carlos
Damborenea, Susana Ester
Manceñido, Miguel Oscar
Iglesia Llanos, María Paula
author_facet Riccardi, Alberto Carlos
Damborenea, Susana Ester
Manceñido, Miguel Oscar
Iglesia Llanos, María Paula
author_sort Riccardi, Alberto Carlos
title The Triassic-Jurassic boundary in the Andes of Argentina
title_short The Triassic-Jurassic boundary in the Andes of Argentina
title_full The Triassic-Jurassic boundary in the Andes of Argentina
title_fullStr The Triassic-Jurassic boundary in the Andes of Argentina
title_full_unstemmed The Triassic-Jurassic boundary in the Andes of Argentina
title_sort triassic-jurassic boundary in the andes of argentina
publishDate 2004
url http://sedici.unlp.edu.ar/handle/10915/97245
https://ri.conicet.gov.ar/11336/81386
https://riviste.unimi.it/index.php/RIPS/article/view/6266
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