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During Leg 31 of the Deep Sea Drilling Project, 13 holes were drilled at nine sites located in the western Philippine Sea, bounded on the east by the PalauKyushu Ridge (Figure 1). Foraminiferal occurrence is nil or limited to certain levels in seven holes, with the exception of Sites 292 and 296. These latter two sites yield abundant and rather well-preserved foraminifera throughout the Pleistocene through Eocene and upper Oligocene sequences represented. Every sample from Sites 292 and 296 was examined on the basis of 200-odd specimens of planktonic foraminifera which were picked out from the residue on the 100-mesh sieve. When necessary, additional specimens of age-determinant taxa were recovered and some fractions that passed through the 100-mesh screen were examined. As revealed previously (e.g., Ujiié and Miura, 1971), the total 200-odd specimens of planktonic foraminifera per sample are necessary and sufficient for recognition of faunal composition on a statistical basis, whereas analysis of the fractions coarser than 100 mesh are primarily effective for identification of age-determinant taxa.

Planktonic Foraminiferal Biostratigraphy in the Western Philippine Sea, Leg 31 of DSDP