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The purpose of this study was to measure the carbonand oxygen-isotope ratios through the upper Cretaceous and across the Cretaceous/Tertiary boundary in the Pacific Ocean (Fig. 1). Deep Sea Drilling Project Site 465 was chosen because of the good to very good preservation of its Cretaceous faunas and a very well-preserved, 100-cm-long, earliest Tertiary "Globigerina" eugubina Zone. The longer section at Site 463 was also measured, where preservation permitted. We made reconnaissance measurements (one per planktonic zone) of the upper Cretaceous from the Turonian through the Maastrichtian. Sampling across the Cretaceous/Tertiary boundary through the early "G. "eugubina Zone. Samples were zoned according to the zonation of van Hinte (1976) for the Cretaceous, and Premoli-Silva and Bolli (1975) for the Paleocene. Unispecific samples of size-graded planktonic foraminifers and uniand multispecific samples of benthic foraminifers were measured. Methods of Shackleton are described in Shackleton and Opdyke (1974). We assumed that the oxygen-isotope ratio records temperature through this time, and we made a correction of 1 .OO%o to SMOW when converting to temperature. The most negative oxygen-isotope planktonic value is used to construct near-surface paleotemperature curves.

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Oxygen- and Carbon-Isotope Variations and Planktonic Foraminifer Depth Habitats, Late Cretaceous to Paleocene, Central Pacific, Deep Sea Drilling Project Sites 463 and 465