Graptolites and trilobites from the Eusebio Ayala Formation (Hirnantian?-early Llandovery), Paraná Basin, eastern Paraguay

A low-diversity graptolite fauna fromthe upper part of the Eusebio Ayala Formation exposed in the intracratonic Paraná Basin of eastern Paraguay is reported herein. The sections studied are composed dominantly of red micaceous mudstones with intercalations of purple sandstones from a series of clay...

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Autores principales: Alfaro, Marta Beatríz, Uriz, Norberto Javier, Cingolani, Carlos Alberto, Tortello, Marcelo Franco, Bidone, Andrea Rosa, Galeano Inchausti, J. C.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2012
Materias:
Geología
graptolites
trilobites
Eusebio Ayala Formation
Hirnantian?–early Llandovery
Paraguay
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/156759
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-156759
record_format dspace
spelling I19-R120-10915-1567592023-08-24T04:06:49Z http://sedici.unlp.edu.ar/handle/10915/156759 Graptolites and trilobites from the Eusebio Ayala Formation (Hirnantian?-early Llandovery), Paraná Basin, eastern Paraguay Alfaro, Marta Beatríz Uriz, Norberto Javier Cingolani, Carlos Alberto Tortello, Marcelo Franco Bidone, Andrea Rosa Galeano Inchausti, J. C. 2012 2023-08-23T18:33:00Z en Geología graptolites trilobites Eusebio Ayala Formation Hirnantian?–early Llandovery Paraguay A low-diversity graptolite fauna fromthe upper part of the Eusebio Ayala Formation exposed in the intracratonic Paraná Basin of eastern Paraguay is reported herein. The sections studied are composed dominantly of red micaceous mudstones with intercalations of purple sandstones from a series of clay quarries (Santa Elena; Galeano; Western Itauguá) around Itauguá city. The graptolites Metaclimacograptus sp., Normalograptus cf. ajjeri (Legrand), and Normalograptus cf. medius (Törnquist) indicate an early Llandovery age for the upper Eusebio Ayala unit. Compared to coeval, postglacial successions in southwestern Gondwana, the graptolites studied have their closest affinities with those from the Rhuddanian lower Lipeón (Subandean Ranges, northwestern Argentina) and La Chilca (Precordillera) formations. In addition, a trilobite assemblage dominated by the genus Mucronaspis was collected from the Eusebio Ayala Formation type locality near Eusebio Ayala city. The latter represents an isolated small outcrop which seems to be latest Ordovician (Hirnantian) in age. Centro de Investigaciones Geológicas Consejo Nacional de Investigaciones Científicas y Técnicas Facultad de Ciencias Naturales y Museo Articulo Articulo http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) application/pdf
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Geología
graptolites
trilobites
Eusebio Ayala Formation
Hirnantian?–early Llandovery
Paraguay
spellingShingle Geología
graptolites
trilobites
Eusebio Ayala Formation
Hirnantian?–early Llandovery
Paraguay
Alfaro, Marta Beatríz
Uriz, Norberto Javier
Cingolani, Carlos Alberto
Tortello, Marcelo Franco
Bidone, Andrea Rosa
Galeano Inchausti, J. C.
Graptolites and trilobites from the Eusebio Ayala Formation (Hirnantian?-early Llandovery), Paraná Basin, eastern Paraguay
topic_facet Geología
graptolites
trilobites
Eusebio Ayala Formation
Hirnantian?–early Llandovery
Paraguay
description A low-diversity graptolite fauna fromthe upper part of the Eusebio Ayala Formation exposed in the intracratonic Paraná Basin of eastern Paraguay is reported herein. The sections studied are composed dominantly of red micaceous mudstones with intercalations of purple sandstones from a series of clay quarries (Santa Elena; Galeano; Western Itauguá) around Itauguá city. The graptolites Metaclimacograptus sp., Normalograptus cf. ajjeri (Legrand), and Normalograptus cf. medius (Törnquist) indicate an early Llandovery age for the upper Eusebio Ayala unit. Compared to coeval, postglacial successions in southwestern Gondwana, the graptolites studied have their closest affinities with those from the Rhuddanian lower Lipeón (Subandean Ranges, northwestern Argentina) and La Chilca (Precordillera) formations. In addition, a trilobite assemblage dominated by the genus Mucronaspis was collected from the Eusebio Ayala Formation type locality near Eusebio Ayala city. The latter represents an isolated small outcrop which seems to be latest Ordovician (Hirnantian) in age.
format Articulo
Articulo
author Alfaro, Marta Beatríz
Uriz, Norberto Javier
Cingolani, Carlos Alberto
Tortello, Marcelo Franco
Bidone, Andrea Rosa
Galeano Inchausti, J. C.
author_facet Alfaro, Marta Beatríz
Uriz, Norberto Javier
Cingolani, Carlos Alberto
Tortello, Marcelo Franco
Bidone, Andrea Rosa
Galeano Inchausti, J. C.
author_sort Alfaro, Marta Beatríz
title Graptolites and trilobites from the Eusebio Ayala Formation (Hirnantian?-early Llandovery), Paraná Basin, eastern Paraguay
title_short Graptolites and trilobites from the Eusebio Ayala Formation (Hirnantian?-early Llandovery), Paraná Basin, eastern Paraguay
title_full Graptolites and trilobites from the Eusebio Ayala Formation (Hirnantian?-early Llandovery), Paraná Basin, eastern Paraguay
title_fullStr Graptolites and trilobites from the Eusebio Ayala Formation (Hirnantian?-early Llandovery), Paraná Basin, eastern Paraguay
title_full_unstemmed Graptolites and trilobites from the Eusebio Ayala Formation (Hirnantian?-early Llandovery), Paraná Basin, eastern Paraguay
title_sort graptolites and trilobites from the eusebio ayala formation (hirnantian?-early llandovery), paraná basin, eastern paraguay
publishDate 2012
url http://sedici.unlp.edu.ar/handle/10915/156759
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