Reconstruction of the collapse of ocean environment of high latitude to Arctic regions based on micropaleontological analysis

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We have studied the Cenozoic paleoceanography related to the sea surfa cestratification, nutrient, and temperature based on nannofossils, planktic foraminifera, and Nutrient isotope analysis. The positive correlation between the coccolith maximum size and Discoaster abundance was recognized in the sequence from Eocene to Pliocene. On the basis of the relationship, the oceanographic condirions of late Eocene, early Miocene, and middle middle Miocene are interpreted as the stratified surface water which indicate the oligotrophic condition.These indicate that the analysis of nannofossis and planktic foraminifera assemblages are useful tool for reconstruction of the stratification or collapse of the sea surface.