Research-paper
The Turonian-Senonian (Coniacian) Boundary in the Anglo-Paris Basin, its correlation with the Turonian-Coniacian Boundary defined in Southern France
Pomerol, Bernard
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Abstract
Recent macrofaunal (Echinoids, Inoceramids) and microfaunal records outline the exact positioning of the Turonian-Senonian boundary in the stratotypical region of Sens (France) and in Southern England. This boundary defined, among many others, by the appearance of Micraster decipiens-normanniae is located below the Turonian-Senonian or Turonian-Coniacian boundary commonly accepted, after DE GROSSOUVRE (1901) or LAMBERT (1903), by many authors. The question of the synchronism between the boundary defined in the Wessex-Paris basin by the Micraster and the Turonian-Coniacian boundary defined in Charentes or Touraine by the Ammonites is therefore asked. In Touraine the base of the Craie de Villedieu, assumed to represent the base of the Senonian and to coincide with the base of the Coniacian, yields faunas which also occur in the Coniacian stratotype or in the chalk of the NW Europe. The correlation, using these faunas, between the Craie de Villedieu and the Senonian stratotype indicates that the Early Senonian chalks with M. decipiens-normanniae have probably no equivalent in Touraine.