EGU General Assembly 2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

Geochemical and palynological evidence for a two-phased end-Triassic mass extinction in the Paris Basin (Lorraine, France)

Natascha Kuhlmann1, Bas van de Schootbrugge2, Jean Thein3, Sven-Oliver Franz3, and Robert Colbach4
Natascha Kuhlmann et al.
  • 1Faculty of Science, Technology and Medicine, Department of Engineering, University of Luxembourg, Esch-zur-Alzette, Luxembourg (
  • 2Department of Earth Sciences, Marine Palynology & Paleoceanography, Utrecht University, Utrecht, Netherlands (
  • 3Institute for Geosciences, University of Bonn, Bonn, Germany (
  • 4Service géologique du l'Etat, Bertrange, Luxembourg (

The Triassic-Jurassic transition, from the Norian to the Hettangian (corresponding to the Rhaetian), was a critical timespan marked by a series of global environmental perturbations, most notably the end-Triassic mass extinction event (201.6 Ma). Here, we present palynological, mineralogical, geochemical, and sedimentological data obtained from new core material spanning the Upper Triassic to Lower Jurassic in the northeastern Paris Basin. Together, these data give new insights into the link between terrestrial and marine extinctions, and their respective driving mechanism. The Boust core (Lorraine, France) provides a complete succession of marginal marine sedimentation. The δ13Corg record from Boust reveals two major C-isotope excursions that, based on the available biostratigraphy, correspond to the Negative-1 (Marshi) and Negative-2 (Spelae) negative isotope excursions. While the Marshi excursion is marked by high abundances of dinoflagellate cysts, the Spelae excursion is marked by an influx of acritarch species. The two excursions bracket an interval of strongly diminished tree pollen abundances and proliferation of fern spore taxa, marking the extinction interval associated with the ETME and forming an equivalent to the Triletes Beds in Germany. This subdivision is confirmed by sedimentological and geochemical results as well as by lithological changes, which are reflecting the development of the depositional environment during the Rhaetian.

How to cite: Kuhlmann, N., van de Schootbrugge, B., Thein, J., Franz, S.-O., and Colbach, R.: Geochemical and palynological evidence for a two-phased end-Triassic mass extinction in the Paris Basin (Lorraine, France), EGU General Assembly 2023, Vienna, Austria, 24–28 Apr 2023, EGU23-6742,, 2023.