Abstract
Microfossil biochronology was examined for sixteen deep observation wells of the National Research Institute for Earth Science and Disaster Prevention (NIED). The subsurface Neogene marine sediments in the Kanto Plain are divided into three stratigraphic units; 8 deposits, post N. 8 deposits and Kazusa-Shimousa Groups, in ascending order. Upper two units widely distribute beneath the Kanto Plain. Post N. 8 deposits covers the pre-Neogene basement rocks unconformably at most localities. In contrast, the 8 deposits is recognized from a few sites, which may represent the sporadic distribution of this unit in the Kanto Plain. Microfossil geochronology of subsurface geology suggests that the post N. 8 deposits can be divided into the Middle to Late Miocene intra-arc basin fills and overlapping Pliocene fore-arc basin sediments.
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