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

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