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A planktonic foraminiferal fauna consisting of 39 species was obtained from the upper Miocene Kubota Formation in the eastern Tanagura area, Northeast Japan. The general composition of the foraminiferal fauna indicates that the Kubota Formation was deposited under an open sea environment influenced by a warm current. The presence of Neogloboquadrina acostaensis, absence of Globorotalia plesiotumida, and the first occurrence of Globorotalia merotumida in the middle part of the Kubota Formation enable a correlation with Zone N.16 of Blow (1969). This foraminiferal zonal assignment is consistent with such stratigraphic data as radiometric, calcareous nannofossil, radiolarian, and diatom ages. We recognize four biohorizons defined by the first occurrences of N. acostaensis, Globorotaloides falconarae, and G. merotumida and the last occurrence of Neogloboquadrina cf. mayeri. These biohorizons will be useful for determining the age of Zone N.16 in Japan.

Planktonic foraminiferal biostratigraphy of the upper Miocene Kubota Formation in the eastern Tanagura area,Northeast Japan.