Deep-sea cores, collected from an area of rough topography along the Clipperton fracture zone, yielded lower Miocene through Holocene planktonic foraminifera and calcareous nannoplankton. The species permit correlation of the cored sediments with the low-latitude plankton biostratigraphic zones and the Californian and European Stages. Paleobiogeographic plankton provinces are analogous to modern ones, suggesting that the general water mass and current patterns were similar throughout the Neogene. The sediment ages indicate that the sea floor in the east-central Pacific may have spread at a faster rate during pre-late Miocene time than during post-late Miocene time.

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