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During Leg 54 drilling was carried out in two regions: the Galapagos Spreading Center (GSC) (Sites 424 and 425), and on the western slope of the East Pacific Rise (EPR) (Sites 419 through 423, and 426 through 429) in the equatorial part of the Pacific Ocean. In the first region, the basalts are overlain by Quaternary foraminifer-nannofossil planktonic oozes and hydrothermal clays with tropical assemblages of planktonic foraminifers rich in number of specimens, but somewhat poor in specific composition. The absence of the Globorotalia crassaformis group and some other species prevents subdivision of the Globorotalia truncatulinoides Zone into five subzonal units. On the EPR, the basalts are overlain by foraminifer-nannofossil, nannofossil, and siliceous calcareous oozes, with planktonic foraminifers strongly affected by selective dissolution. At Sites 419 and 420 the section begins with late Pliocene (the Globorotalia tosaensis Zone). To the east, nearer the axial part of the ridge, the basalts are overlain by sediments of Quaternary age. The morphology distribution, frequency of occurrence, stability to selective dissolution, and paleoclimatic significance of selected species of planktonic foraminifers are discussed.

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Planktonic Foraminiferal Biostratigraphy of Pliocene and Quaternary Deposits of the East Pacific Rise and the Galapagos Spreading Center, Deep Sea Drilling Project Leg 54