120 (mid MIS 8, 274e283 ka), and G14 with Shiobara-Otawara (So-OT: mid MIS 9, 320 ka). We classified
spike G6 as a turbidite. The two lowest of these tephras, ODP794 2H-2-120 and So-OT, were assigned to
MIS 7 in a previous age model on the basis of the first occurrence of Emiliania huxleyi. However, our
tephra-based age model is consistent with the last occurrence of Proboscia curvirostris, and we assigned
the core sediment corresponding to MIS 7 from a previously reported segment 55 m long to a younger
segment 22 m long, and then verified that the sedimentation rate was constant through the core. We
used the newly obtained age for the WP tephra, along with outcrop and borehole core evidence, to
reconsider the marine terrace chronology in the Kamikita Plain. A marine terrace that was previously
assigned to MIS 7 with a possible vertical fault offset was reinterpreted as two separate terraces, one
correlated with MIS 7e or 7c and the other with MIS 9. Regional uplift rates based on the revised terrace
chronology and shoreline angle elevations appear to have been fairly steady at 0.18e0.36 m/ky during
the late Quaternary.
120 (mid MIS 8, 274e283 ka), and G14 with Shiobara-Otawara (So-OT: mid MIS 9, 320 ka). We classified
spike G6 as a turbidite. The two lowest of these tephras, ODP794 2H-2-120 and So-OT, were assigned to
MIS 7 in a previous age model on the basis of the first occurrence of Emiliania huxleyi. However, our
tephra-based age model is consistent with the last occurrence of Proboscia curvirostris, and we assigned
the core sediment corresponding to MIS 7 from a previously reported segment 55 m long to a younger
segment 22 m long, and then verified that the sedimentation rate was constant through the core. We
used the newly obtained age for the WP tephra, along with outcrop and borehole core evidence, to
reconsider the marine terrace chronology in the Kamikita Plain. A marine terrace that was previously
assigned to MIS 7 with a possible vertical fault offset was reinterpreted as two separate terraces, one
correlated with MIS 7e or 7c and the other with MIS 9. Regional uplift rates based on the revised terrace
chronology and shoreline angle elevations appear to have been fairly steady at 0.18e0.36 m/ky during
the late Quaternary.
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