Abstract
Results are presented of an integrated stratigraphic (calcareous plankton biostratigraphy, cyclostratigraphy and magnetostratigraphy)
study of the Serravallian=Tortonian (S=T) boundary section of Monte Gibliscemi (Sicily, Italy). Astronomical
calibration of the sedimentary cycles provides absolute ages for calcareous plankton bio-events in the interval between
9.8 and 12.1 Ma. The first occurrence (FO) of Neogloboquadrina acostaensis,
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