Figure 8. Adopted calcareous nannofossil biochronology for the late Neogene period. Geomagnetic-polarity time scale from Berggren et al. (1995b). A. Datums for the Pliocene-Pleistocene interval. Most age estimates are those used during Leg 172 (Shipboard Scientific Party, 1998). B. Acme zones for the last 1.25 m.y. Calibrations to isotopic stages after Weaver (1993), except for the top and bottom of the Small Gephyrocapsa Zone (Gartner, 1977), which have been recalibrated using updated ages (this study).

Figure 8. Adopted calcareous nannofossil biochronology for the late Neogene period. Geomagnetic-polarity time scale from Berggren et al. (1995b). A. Datums for the Pliocene-Pleistocene interval. Most age estimates are those used during Leg 172 (Shipboard Scientific Party, 1998). B. Acme zones for the last 1.25 m.y. Calibrations to isotopic stages after Weaver (1993), except for the top and bottom of the Small Gephyrocapsa Zone (Gartner, 1977), which have been recalibrated using updated ages (this study).