Abstract
Biostratigraphic correlation using benthic foraminifera is discussed in a paleoceanographic point of view. Based on the compiled data on the geographic distribution of shallow-water benthic foraminifera during the Mid-Neogene climatic optimum (MNCO), the coastal seas of the Northwest Pacific at around 16Ma are divided into four paleobiogeographic provinces; subtropical, warm temperate, mild temperate, and cool temperate.A similar pattern of thermal gradient is recognized in the transition period between the MNCO and the following cooler stage (early Middle Miocene), though each province shifted southward compared with those in the MNCO. This biogeographic trend is a useful guideline to test the validity of inter-regional correlation.
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