Counts of calcareous nannofossil subordinate taxa in the upper part of the Kiwada Formation. The symbol "+" shows present but not counted.

Counts of calcareous nannofossils in the upper part of the Kiwada Formation. The symbol "+" shows present but not counted.

The improved age tie points based on the benthic δ18O records in the upper part of the Kiwada Formation. The age of Sample A0926-02 was modified from Kuwano et al. (2021).

Benthic foraminiferal oxygen isotope values in the Ono River section from the upper part of the Kiwada Formation

We present calcareous nannofossil abundance data obtained from the upper part of the Kiwada Formation, Kazusa Group, distributed in the central part of the Japanese Archipelago....