Stratigraphic correlation chart of sampled intervals. The correlation follows the six locations in the described sequence from southwest to northeast. The chronostratigraphy follows the GTS2020 (Gradstein et al. 2020), with the exception of the N7/N8 boundary, which follows Hoshi et al. (2019). The planktonic foraminifer zones (P.F.) are from Blow (1969). The diatom zones (D.NPD) follow Yanagisawa and Akiba (1998). The stratigraphic correlation is based on Yanagisawa (1999), Nakajima et al. (2019), and Irizuki et al. (2021).