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Middle Miocene and upper Miocene diatoms recovered during Deep Sea Drilling Project Leg 63 allow refinement of eastern North Pacific diatom biostratigraphy and permit several ties with low-latitude biostratigraphy. Numerous datum levels provide excellent correlation between individual Leg 63 sites (23°N-34°N) and with Site 173 (40°N) off northern California. Three intervals of widespread hiatus development appear to be related to intensification of bottom-water activity (erosion and/or corrosion) associated with growth of the Antarctic ice sheet. These intervals include one near the end of the middle Miocene (ca. 12-11 Ma), one in the early late Miocene (ca. 10-9 Ma), and one in the late late Miocene (ca. 7.2-6.2 Ma). During the early to middle part of the Pliocene (ca. 4.5-2.5 Ma), diatom productivity declined off southern California, probably associated with an interval of relative climatic warming. Three new taxa are proposed, Annellus californicus var. hannai, n. var., Bogoroviapaleacea var. elongata, n. var., and Coscinodiscus temperei var. delicata, n. var.

Late Cenozoic Diatom Biostratigraphy and Paleoceanography of the Middle-Latitude Eastern North Pacific, Deep Sea Drilling Project Leg 63