NEW BIOSTRATIGRAPHIC DATA ON THE CENOMANI AN-TURONIAN BOUNDARY - THE CASSIS SECTION (SE FRANCE) - PROPOSAL FOR A EUROPEAN HYPOSTRATOTYPE

The discovery of a rich ammonite and inoceramid assemblage at the Cass is section enables the establishment of a new integrated biozonation f or the Cenomanian-Turonian boundary, Four ammonite zones, four inocera mid associations and three planktonic foraminifera zones are recognize d, The definitions of the traditional 'standard' ammonite and inoceram id zones/associations are discussed herein. A critical comparison with the stratotype at Pueblo (USA) supports the proposal of the Cassis se quence as a European hypostratotype of the Cenomanian-Turonian boundar y.