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Silurian (Llandovery) monograptids from the Vargas Peña Formation (Paraná Basin, Eastern Paraguay)
Uriz, Norberto J. (Museo de La Plata. División Geología)
Beatriz Alfaro, Marta (Museo de La Plata. División Geología)
Galeano Inchausti, Julio C. (Paraguay. Ministerio de Obras Públicas y Comunicaciones. Subsecretaria de Minas y Energía)

Date: 2008
Abstract: The Itacurubí Group is a siliciclastic Silurian sequence exposed in eastern Paraguay (Paraná Basin). It includes from bottom to top the Eusebio Ayala, Vargas Peña and Cariy formations. The entire sedimentary group has yielded a rich association of invertebrates, ichnofossils and palynomorphs. The low-diversity graptolite fauna found within the uppermost beds of the Vargas Peña Formation is described herein. The monograptids comprising this fauna are Stimulograptus aff. sedgwickii (PORTLOCK), Monograptus aff. priodon (BRONN) and ?Demirastrites sp. These taxa confirm the presence of late Aeronian-early Telychian deposits. The accompanying fossil assemblage also suggests a Mid-Llandovery age for this unit. The recognized graptolite biozones allow us to correlate the Vargas Pena Formation with other Silurian units in South America. From the palaeoenvironmental point of view this sector of the Parana Basin reflects a shallow shelf with high tolerance to oxygen invertebrates association.
Rights: Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan aquestes es distribueixin sota la mateixa llicència que regula l'obra original i es reconegui l'autoria de l'obra original. Creative Commons
Language: Anglès
Document: Article ; recerca ; Versió publicada
Subject: Graptolites ; Monograptid ; Biostratigraphy ; Silurian ; Paraguay ; Gondwana
Published in: Geologica acta, Vol. 6, Núm. 2 (Juny 2008) , p. 181-190, ISSN 1696-5728

Adreça alternativa: https://raco.cat/index.php/GeologicaActa/article/view/129630
Adreça alternativa: https://revistes.ub.edu/index.php/GEOACTA/article/view/105.000000250
DOI: 10.1344/105.000000250


10 p, 1.6 MB

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Articles > Published articles > Geologica acta
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 Record created 2012-01-27, last modified 2024-02-23



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