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À. A. Chauvin, P. Lanos, C. Géosciences-rennes, C. De-beaulieu, and . Bât, F-35042 Rennes CEDEX, France. M. Gómez-Paccard, Facultat de Geología, Departament d'Estratigrafía, Paleontología i Geociències Marines, Martí i Franquès s/n, E-08028 Barcelona, Spain. (mgomezpaccard@ub.edu) J. Thiriot, Laboratoire d'archéologie médiévale méditerranéenne, UMR6572, Maison méditerranéenne de Sciences de l'Homme, CNRS, F-13094