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Laboratoire de Géologie, UPRES EA 2644, Faculté des Sciences, 2 Bd Lavoisier, 49045 Angers cedex and Laboratoire d'Étude des Bio-Indicateurs Marins (LÉBIM) de l'ı̂le d'Yeu, France
Laboratoire d'écologie des eaux continentales méditerranéennes. Fac. Sciences et Techniques de St Jérôme, Université d'Aix Marseille 3, 13395 Marseille cedex 20, France
Université P. et M. Curie, URA CNRS 1761 Paléontologie et stratigraphie, 4 place Jussieu, Boite 106, tour 26/16, 4° étage, 75252 Paris cedex 5, France