Análisis bioestratigráfico del Eoceno Inferior de la sección de Barinatxe (Pirineos Occidentales) mediante nanofósiles calcáreos

Resumen

The Barinatxe section (Western Pyrenees) contains one of the most complete and expanded deep-water succession of the early Eocene so far described. The succession, cropped out continuously along sea cliffs, is rich in well preserved calcareous nannofossil. The calcareous nannofossil study carried out in Barinatxe section, where a total of 70 autochthonous early Eocene calcareous nannofossil species have been identified, has allowed us to identify Zones NP10, NP11, NP12 and NP13. Furthermore, we have precisely pinpointed the succession of calcareous nannofossil biohorizons and their relative position within the planktic foraminifer zones. The calcareous nannofossil and planktic foraminifer intercalibration scheme resulted from this study does not agree with the current standard biomagnetochronologic correlation scheme. In order to corroborate or contradict our observations similar studies in sections of a wide range of latitudes and depositional environments are needed.