Fig. 1

Map showing the studied sea area and location of Site U1423. The locations of ① Site 795, ② Site 794, and ③ Site 797 in Heusser (1992) and ④ Site GH02–1030 in Igarashi et al. (2011) are also shown (from Igarashi et al. 2018)
Map showing the studied sea area and location of Site U1423. The locations of ① Site 795, ② Site 794, and ③ Site 797 in Heusser (1992) and ④ Site GH02–1030 in Igarashi et al. (2011) are also shown (from Igarashi et al. 2018)