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Upper Mesozoic and Cenozoic sediments penetrated at deep-sea drill sites in the tropical and subtropical central Pacific Ocean often contain discrete horizons with reworked and displaced biogenic sediment components which can include fossils produced by benthic organisms living in neritic environments and by oceanic plankton. All four drill sites of Deep Sea Drilling Project Leg 62 in the central North Pacific Ocean received an influx of benthic shallow-water fossils during the late Mesozoic, and of planktonic as well as shallow-water benthic fossils during the Cenozoic. In general, reworked and displaced sediment components from these two widely different source areas occur in discrete horizons and separate from each other, although in certain instances they have been observed together. The flux of shallow-water components to the deep sea is almost entirely restricted to eight intervals of low eustatic sea-level stands during late Mesozoic and Cenozoic times. Non-contemporaneous pelagic-fossil assemblages which indicate reworking in intermediate and deep waters are restricted to the Cenozoic sections of the Leg 62 sites, whereas they have not been noted in the Mesozoic parts of the penetrated sedimentary sequences. A similar difference of pre-Maastrichtian and Maastrichtian-Pleistocene sections has been observed elsewhere in the central Pacific Ocean. This difference seems to point to a fundamental change from a very quiet and sluggish bottom-water circulation during pre-Maastrichtian time to a Maastrichtian and Cenozoic paleoenvironment when currents in the intermediate and deep waters eroded wide regions of the central Pacific Ocean.

Reworked Fossils in Mesozoic and Cenozoic Pelagic Central Pacific Ocean Sediments, Deep Sea Drilling Project Sites 463, 464, 465, and 466, Leg 62