Abstract
The paleoenvironmental studies of the Japan Sea are mainly based on the analyses of the piston cores taken from the southern part of the sea. The lithological feature and oxygen isotopic curves of planktonic and benthic foraminiferal tests in a core taken from the eastern part of the sea are completely the same as those of the cores from the southern part. This indicates that the paleoenvironmental reconstruction of the Japan Sea based on the cores from the southern part is reasonable and applicable to much wider area of the Japan Sea.
