Jurassic and Lower Cretaceous calcareous nannofossils in the western North Atlantic (Site 534): biostratigraphy, preservation, and some observations on biogeography and paleoceanography.

Abstract

Calcareous nannofossil assemblages recovered from a continuous section ranging in age from Callovian to middle Albian are described. Coccolith preservation, combined with backtracking of Site 534 is used to indicate the CCD. A revised zonation for the Jurassic is used to subdivide the middle Callovian to Tithonian interval into five zones and subzones. Lower Cretaceous coccolith and dinoflagellate zones are correlated. The relationship of calcareous nannofossil zones with magnetostratigraphic units and stages is shown. -from Author