These observations cast doubt on the earlier idea of a decline in biodiversity or biological extinction between the Cambrian and Ordovician periods some 485 million years ago. On the other hand, the high biodiversity observed confirms the hypothesis that species migrated to the southern hemisphere as a refuge zone, to escape the excessively high temperatures of tropical zones at that time.
This first study of the site, published in Nature Ecology & Evolution , is the starting point for a research program that will extend over several years, with large-scale excavations followed by in-depth analysis of the fossils using innovative imaging techniques. The aim is to reveal in detail their external and internal anatomy, their kinship relationships and their way of life.
- Working at the Laboratoire de Géologie de Lyon : Terre, Planètes, Environnement LGL-TPE (CNRS/Université Claude Bernard Lyon 1/ENS de Lyon/Université Jean Monnet) and at the Institut photonique d’analyse non-destructive européen des matériaux anciens IPANEMA (CNRS/Université Paris-Saclay).
ReferenceThe Cabrières Biota (France) provides insights into Ordovician polar ecosystems. Farid Saleh, Lorenzo Lustri, Pierre Gueriau, Gaëtan J.-M. Potin, Francesc Pérez-Peris, Luká? Laibl, Valentin Jamart, Antoine Vite, Jonathan B. Antcliffe, Allison C. Daley, Martina Nohejlová, Christophe Dupichaud, Sebastian Schöder, Emilie Bérard, Sinéad Lynch, Harriet B. Drage, Romain Vaucher, Muriel Vidal, Eric Monceret, Sylvie Monceret and Bertrand Lefebvre. Nature Ecology and Evolution , February 9.
DOI : 10.1038/s41559’024 -02331-w
CNRS technical engineer