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During Leg 86, Sites 576-581 were drilled in the northwest Pacific Ocean. Only Sites 576, 577, and 580 contain calcareous nannofossils. The cored stratigraphic sequences range from lower Campanian to Pleistocene, although some of the stratigraphic sequences are discontinuous because of hiatuses or poor core recovery. Site 576 was drilled at the eastern flank of the Shatsky Rise, and recovered a common and moderately well preserved calcareous nannofossil assemblage of lower Maestrichtian to lower Campanian age. Site 577 was drilled on the southwest flank of the Shatsky Rise. Three holes were hydraulically piston cored. Holes 577 and 577A both recovered a very good late Cenozoic to Late Cretaceous sediment section with a major hiatus from the middle Miocene to the middle Eocene. An undisturbed and extended Cretaceous/Tertiary boundary sequence was recovered. An additional core containing the Cretaceous/Ifertiary boundary was recovered from Hole 577B. Coccoliths are generally abundant and diversified. Preservation is moderate to poor. The Cretaceous/Tertiary boundary is located in all three holes at a sub-bottom depth of about 109.6 m. A detailed investigation of the calcareous nannofossil assemblage was conducted on samples from Site 577, and particular attention was given to the flora at the Cretaceous/Ifertiary boundary. Few selected early Tfertiary species have been investigated both by light and scanning electron microscope. At Site 580 only one sample (Core Catcher 3) contains calcareous nannofossils. They are poorly preserved and indicate a probable Pliocene age.

Campanian to Pleistocene Calcareous Nannofossil Stratigraphy from the Northwest Pacific Ocean, Deep Sea Drilling Project Leg 86