Calcareous plankton high resolution biostratigraphy (foraminifera and nannofossils) of the uppermost Langhian-lower Serravallian Ras il-Pellegrin section (Malta)

Results of an integrated biostratigraphic (calcareous nannofossils and planktonic foraminifera) study of the uppermost Langhian/lower Serravallian Ras il-Pellegrin section (Fomm ir-Rih Bay - Malta) are presented. This high resolution study allowed us to recognize several useful lower Serravallian bio-events in the Mediterranean and to provide a detailed distribution pattern of the recognized taxa. The astrochronological calibration, reported in a different paper of this volume, provide absolute ages of the bio-events of the studied section. The LO (Last Occurrence) of Globorotalia peripheroronda at 13.39 Ma, the Paragloborotalia partimlabiata FO (First Occurrence) at 12.62 Ma and the Paragloborotalia mayeri FCO (First Common Occurrence) at 12.34 Ma among the planktonic foraminifera, and the Sphenolithus heteromorphus LO at 13.59 Ma, the Cyclicargolithus floridanus LCO (Last Common Occurrence) at 13.39 Ma, the Reticulofenestra pseudoumbilicus FCO at 13.32 Ma, the Calcidiscus macintyrei FO at 12.57 Ma and the Calcidiscus premacintyrei LCO at 12.51 Ma among the calcareous nannofossils, were recorded. Moreover, our results confirm the LO of S. heteromorphus as a fairly synchronous event in the Mediterranean and in the Atlantic and Pacific Oceans. Therefore, a lithological level near or coincident with this event maybe considered a good candidate for the definition of the GSSP of the Serravallian.