Calcareous nannoplankton from the Southwest Pacific Ocean

The positions of all cores recovered during Leg 90 in the southwest Pacific are shown within the standard calcareous nannoplankton zonation. The stratigraphic and regional occurrences and preservation of Paleogene calcareous nannoplankton found at Sites 588, 592, and 593 are discussed, and fossil lists are given for selected samples. Data on the Eocene/Oligocene boundary found in Holes 592 and 593 and on the Oligocene/Miocene boundary in Hole 588C are presented. Regional unconformities are noted in Hole 588C, where the upper Eocene to middle Oligocene interval (Zones NP17 to NP23) is missing, and in Hole 592, in which the middle Oligocene to lowest Miocene interval (Zones NP23 to NN1) is not represented.

Ebridians and actiniscidians from DSDP Leg 90 sites

Ebridians and actiniscidians are described from Sites 588, 591, and 594 in the southwest Pacific. The middle Miocene to early Pliocene interval at Site 591 can be subdivided into five ebridian-actiniscidian zones. These are correlated to standard nannoplankton zones. Five new species are described from the Neogene of the southwest Pacific: Ammodochium serotinum, Hermesinum obliquum, Actiniscus flosculus, A. laciniatus, and A squamosus.