Coccolith biostratigraphy of the North Atlantic Ocean, Deep Sea Drilling Project Leg 94.

Abstract

We studied calcareous nannofossil assemblages in 860 samples recovered during DSDP Leg 94 in order to estimate the age of the sediments at 6 sites in the N Atlantic Ocean. Twenty-one biohorizons are recognized in the Neogene and Quaternary sequences deposited at middle and high latitudes. Correlation of these biohorizons with the magneto-stratigraphy established for the same cores indicates that these biohorizons, the LAD and FAD of Helicosphaera inversa and the LAD of Sphenolithus abies, are ecologically controlled and cannot be used as stratigraphic indicators. In the floral reference list one new species is described.-from Authors