Review of the Ediacaran-Lower Ordovician (pre-Sardic) stratigraphic framework of the Eastern Pyrenees, southwestern Europe


  • M. PADEL Bureau de Recherches Géologiques et Minières (BRGM) Z3 Avenue Claude Guillemin, 45100 Orléans, France.
  • S. CLAUSEN Unité Mixte de Recherche (UMR), université de Lille 8198 EEPCNRS, Université de Lille 1, Bâtiment SN5, Avenue Paul Langevin, 59655 Villeneuve d’Ascq Cedex, France
  • J.J. ÁLVARO Instituto de Geociencias (CSIC-Universidad complutense de Madrid) Dr. Severo Ochoa 7, 28040 Madrid, Spain.
  • J.M. CASAS Departament de dinàmica de la Terra i de l’Oceà - Institut de Recerca Geomodels, Universitat de Barcelona C/Martí i Franquès s/n, 08028 Barcelona, Spain.


Lithostratigraphy, Chronostratigraphy, Palaeogeography, Cambrian, NW Gondwana.


The Ediacaran-Lower Ordovician successions exposed in the Eastern Pyrenees are updated and revised based on recent U-Pb zircon radiometric ages, intertonguing relationships of carbonate-dominated strata, and onlapping patterns marking the top of volcano-sedimentary complexes. A stratigraphic comparison with neighbouring pre-Variscan outcrops from the Montagne Noire (southern French Massif Central) and Sardinia is related to i) the absence of Cadomian deformation close to the Ediacaran-Cambrian boundary interval; ii) the presence of an episodic, Cadomian-related, acidic-dominant volcanism related to carbonate production punctuating the Ediacaran-Cambrian transition, similar to that recorded in the northern Montagne Noire; and iii) the lack of Guzhangian (Late Cambrian Epoch 3) regressive shoal complexes present in the Montagne Noire and probably in Sardinia.