Cenozoic calcareous nannofossil biostratigraphy from the north- eastern Atlantic Ocean - Deep Sea Drilling Project Leg 81.

Abstract

A biostratigraphic analysis of sedimentary sequences reveals continuous upper Neogene deposition at all sites, except at Site 555, where the Pliocene is missing. The series of Pliocene discoaster disappearances are practically synchronous with their low latitude extinctions. The onset of ice rafting is an abrupt event, which reflects the initiation of major northern European glaciation at 2.4 my ago. The lower and middle Miocene sequences are poorly represented, except at Site 555 which shows an expanded and continuous middle Miocene sequence.-from Author