Calcareous nannofossil biostratigraphy of DSDP Site 132 Leg 13 ( Tyrrhenian Sea - western Mediterranean).

It was possible to recognize 5 nannofossil biozones in the Pliocene and 3 biozones in the Pleistocene, defined by simple and widely spread forms. In the studied succession, characterized by good nannofossil contents and no reworking at all, it is possible to further subdivide these zones in a rather simple way, thus obtaining 7 biostratigraphic intervals (zones and subzones) in the Pliocene and 6 intervals in the Pleistocene. The adopted subdivision for the latter is practically superimposable on the recent zonation proposed by Gartner in oceanic sediments