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Faunal composition and paleoenvironmental reconstruction of a Middle–Late Triassic boundary assemblage in the Pyrenean basin (Catalonia, NE Spain)

Published online by Cambridge University Press:  08 November 2021

Ruben Garcia-Artigas
Affiliation:
Water Research Institute (IdRA), University of Barcelona, 08028 Barcelona, Spain Mineralogy, Petrology and Applied Geology Department, Faculty of Earth Sciences, University of Barcelona, 08028 Barcelona, Spain
Ramon Mercedes-Martín
Affiliation:
Departament de Geologia. Unitat d'Estratigrafia. Universitat Autònoma de Barcelona. Cerdanyola del Vallès E-08193, Barcelona, Spain
Joan Cartanyà
Affiliation:
Institut Català de Paleontologia, Universitat Autònoma de Barcelona. Edifici ICTA-ICP, c/Columnes s/n, Campus de la UAB, 08193, Cerdanyola del Vallès Barcelona, Spain , , , Centre d'Història Natural de la Conca de Barberà C/ Pedrera, 2–43400 Montblanc, Tarragona, Spain
Arnau Bolet
Affiliation:
Institut Català de Paleontologia, Universitat Autònoma de Barcelona. Edifici ICTA-ICP, c/Columnes s/n, Campus de la UAB, 08193, Cerdanyola del Vallès Barcelona, Spain , , , School of Earth Sciences, University of Bristol, Wills Memorial Building, Queens Road, Bristol BS8 1RJ, United Kingdom
Marc Riccetto
Affiliation:
Institut Català de Paleontologia, Universitat Autònoma de Barcelona. Edifici ICTA-ICP, c/Columnes s/n, Campus de la UAB, 08193, Cerdanyola del Vallès Barcelona, Spain , , ,
Josep Fortuny*
Affiliation:
Institut Català de Paleontologia, Universitat Autònoma de Barcelona. Edifici ICTA-ICP, c/Columnes s/n, Campus de la UAB, 08193, Cerdanyola del Vallès Barcelona, Spain , , ,
*
*Corresponding author

Abstract

The Ladinian–Carnian transition in the Tethys domain was accompanied by an important environmental change representing a milestone in the climate evolution of the Triassic. However, estimations on paleodiversity composition and paleoenvironmental conditions across this interval are scarce in marine settings due to the lack of fossil-bearing successions. In this work, a refined paleontological and sedimentological study has allowed us to better characterize a well-preserved marine ?Ladinian–Carnian carbonate succession in the South Central Pyrenees (Odèn site, Catalonia, NE Spain). Vertebrate faunas include numerous actinopterygian specimens, forming an assemblage composed of at least four taxa: Peltopleurus cf. P. nuptialis Lombardo, 1999, Saurichthys sp., Colobodus giganteus (Beltan, 1972), and an indeterminate halecomorph. Specimens belonging to the genus Peltopleurus are dominant; the long-snouted Saurichthys, the halecomorph, and the large-bodied Colobodus giganteus are less abundant. Tetrapod remains are scarcely present and are assigned to sauropterygians. Invertebrate faunas include bivalves (Pseudocorbula gregaria [Münster in Goldfuss, 1838]) and brachiopods (Lingula sp.). The fossil assemblage was recovered from organic-rich laminated silty mudstone layers. Sedimentological and textural analyses suggest that fossil biotas were deposited below the fair-weather wave base in shallow subtidal coastal settings. These environments were sporadically sourced by silt/clay. The age of the Odèn site, on the basis of the recovered fauna, is assigned to the ?late Ladinian–middle Carnian (Middle–Late Triassic), which is in agreement with previously published ages based on palynomorph data.

The refined integration of paleontological, sedimentological, and biostratigraphic data from the Odèn site and other vertebrate-bearing localities in the Tethys domain can help better constrain the paleoenvironmental conditions and paleogeographical configuration impacting ecosystem diversity during the late Ladinian–Carnian interval.

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Copyright © The Author(s), 2021. Published by Cambridge University Press on behalf of The Paleontological Society

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Faunal composition and paleoenvironmental reconstruction of a Middle–Late Triassic boundary assemblage in the Pyrenean basin (Catalonia, NE Spain)
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