Artículo
Graptolites and trilobites from the Eusebio Ayala Formation (Hirnantian?–early Llandovery), Paraná Basin, eastern Paraguay
Alfaro, Marta Beatriz; Uriz, Norberto Javier; Cingolani, Carlos Alberto
; Tortello, Marcelo Franco
; Bidone, Andrea Rosa; Galeano Inchausti, Julio César
Fecha de publicación:
04/2013
Editorial:
John Wiley & Sons Ltd
Revista:
Geological Journal (chichester)
ISSN:
0072-1050
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
A low-diversity graptolite fauna from the 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.
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Articulos(CIG)
Articulos de CENTRO DE INVEST.GEOLOGICAS (I)
Articulos de CENTRO DE INVEST.GEOLOGICAS (I)
Citación
Alfaro, Marta Beatriz; Uriz, Norberto Javier; Cingolani, Carlos Alberto; Tortello, Marcelo Franco; Bidone, Andrea Rosa; et al.; Graptolites and trilobites from the Eusebio Ayala Formation (Hirnantian?–early Llandovery), Paraná Basin, eastern Paraguay; John Wiley & Sons Ltd; Geological Journal (chichester); 48; 4-2013; 236-247
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