Abstract
Late Miocene planktonic foraminiferal biostratigraphy was presented from the Arakawa Group deposited in the intra-arc basin of the forearc side, central Honshu, Japan. The stratigraphic interval between the upper part of the Ogane and Tanokura Formations of the group is correlated with the planktonic foraminferal Zone N.16 of Blow (1969) because of the occurrence of Neogloboquadrina acostaensis and the absence of Globorotalia plesiotumida. This correlation shows no significant contradiction with other biostratigraphic results, namely, diatom, radiolarian, and calcareous nannofossil based on the standard age correlation table of Saito (1999). The species composition of the present study significantly differs from that of the contemporaneous Kubota Formation in the eastern Tanagura area, about 50km northeast of the present area. It is supposed that the difference between the two areas would be influenced by an intensity of a warm current.
