NEW CALIBRATION OF NEOGENE RADIOLARIAN EVENTS IN THE NORTH PACIFIC

New age models for twelve Deep Sea Drilling Project sites in the North Pacific have been produced, based on (in order of importance in our d ataset) a recompilation of previously published diatom, calcareous nan nofossil and foraminifer first and last occurrences, and magnetostrati graphy. The projected ages of radiolarian first and last occurrences d erived from the line of correlation of the age/depth plots have been c omputed from these sites, and 28 radiolarian events have thereby been newly cross calibrated to North Pacific diatom and other stratigraphy. Several of the North Pacific radiolarian events are older than in pre viously published equatorial Pacific calibrations, and some may be dia chronous within the North Pacific. These patterns may be due to comple x latitudinal patterns of clinal variation in morphotypes within linea ges, or to migration events from the North Pacific towards the Equator .