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Two sites (463 and 466) drilled during Deep Sea Drilling Project Leg 62 in the central North Pacific yielded substantial Neogene calcareous sequences. At Site 463, in the Mid-Pacific Mountains, a very condensed upper Miocene to Pleistocene section accumulated at an average rate of 3 m/m.y., whereas at Site 466, on southern Hess Rise, a welldeveloped Pliocene-Pleistocene sequence accumulated at an average rate of 15 m/m.y. The latter sequence provides a valuable complement to that of nearby Site 310, on central Hess Rise. An abrupt change in sedimentary regime occurred about 4.2 m.y. ago on Hess Rise, from very slow deposition or non-deposition during the early Neogene, to more-normal pelagic sedimentation during the rest of the Neogene and Pleistocene. At both Sites 463 and 466, as at other drilling sites of the central North Pacific, the lower few meters of the Neogene section contain mixed sediments, which include common reworked Eocene foraminifers and abundant phillipsite and are separated from underlying sediments by a major unconformity (equivalent to a time span of about 20 m.y. or more). Site 463 lies under the central area of the subtropical central water mass, whereas Site 466 lies under its northern part, near the boundary with transitional waters. Planktonic-foraminifer faunas at Site 463 are dominated by Globigerinoides ruber, and those at Site 466 by right-coiling Neogloboquadrina pachyderma and globorotaliids of the G. conoidea and G. inflata groups. Climate-induced shifting of water masses throughout the Plio-Pleistocene is recorded at Site 466, as well as at other mid-latitude sites of the North Pacific. During two intense coolings in the middle Pliocene (~3.1 m.y. ago) and in the late Pleistocene (~0.8 m.y. ago), left-coiling TV. pachyderma migrated south over southern Hess Rise. Short-term fluctuations in carbonate content correctable over the equatorial Pacific and central Hess Rise are not detected in the carbonate stratigraphies of Sites 466 and 463 established with a sampling interval of about 70,000 and 500,000 years, respectively.

Neogene Planktonic Foraminifers from the Central North Pacific, Deep Sea Drilling Project Leg 62