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During DSDP Leg 58 nine holes were drilled at five sites in the northern Philippine Sea (Figure 1). LowerMiocene to Quaternary calcareous nannofossils were recovered from the three sites in the Shikoku Basin, whereas lower-Eocene to Quaternary assemblages were recovered at the two sites in the Daito Ridge and Basin province. Nannofossils are sporadic at all sites, except Site 445, where abundant nannofossils occur continuously in most cores. The age and zone assignments of the cores (Table 1), based upon light microscope observation, essentially follow Bukry (1973, 1975). In the Pleistocene, the names and concepts of Bukry's zones are slightly modified to accommodate results of recent studies (Haq et al., 1977; Gartner, 1977). The Emiliania overta Subzone is replaced by the Pseudoemiliania lacunosa Subzone. The Crenalithus doronicoides Zone is not divided into subzones, and its top is marked by the beginning of the acme, instead of by the first occurrence of Gephyrocapsa oceanica. In the middle Miocene, the Helicopontosphaera kamptneri Subzone is replaced by the Helicosphaera carteri Subzone. The following nannoplankton species are considered in this report:

Calcareous Nannofossils from Deep Sea Drilling Project Sites 442 through 446, Philippine Sea