Faunal composition and paleoenvironmental reconstruction of a Middle-Late Triassic boundary assemblage in the Pyrenean basin (Catalonia, NE Spain)
Garcia-Artigas, Ruben (Universitat de Barcelona. Institut de Recerca de l'Aigua)
Mercedes Martín, Ramon (Universitat Autònoma de Barcelona. Departament de Geologia)
Cartanyà, Joan (Institut Català de Paleontologia Miquel Crusafont)
Bolet, Arnau (Institut Català de Paleontologia Miquel Crusafont)
Riccetto, Marc (Institut Català de Paleontologia Miquel Crusafont)
Fortuny, Josep (Institut Català de Paleontologia Miquel Crusafont)

Data:	2022
Resum:	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.
Ajuts:	Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-86 Ministerio de Ciencia e Innovación IJC2018-037685-I
Nota:	Altres ajuts: We acknowledge support from the CERCA programme (ICP) from the Generalitat de Catalunya, and the projects "Vertebrats del Permià i el Triàsic de Catalunya i el seu context geologic" (Ref. 2010/70085), "Evolució dels ecosistemes amb faunes de vertebrats del Permià i el Triàsic de Catalunya" (ref. 2014/100606) and "Evolució dels ecosistemes durant la transició Paleozoic-Mesozoic a Catalunya" (ref. CLT009/18/00066)
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.
Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Publicat a:	Journal of Paleontology, Vol. 96, Issue 2 (March 2022) , p. 412-427, ISSN 1937-2337

DOI: 10.1017/jpa.2021.99

Postprint 42 p, 2.6 MB

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