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Progress in Earth and Planetary Science
Fig. 6 | Progress in Earth and Planetary Science

Fig. 6

From: Geological history of the land area between Okinawa Jima and Miyako Jima of the Ryukyu Islands, Japan, and its phylogeographical significance for the terrestrial organisms of these and adjacent islands

Fig. 6

Correlation of the Ryukyu Group. Correlation of the Ryukyu Group on the Miyako Islands and three areas of Okinawa Jima with oxygen isotope stratigraphy and calcareous nannofossil biostratigraphy established at Integrated Ocean Drilling Program Site U1308 in the North Atlantic Ocean (Sato et al. 2009). Numbers on the oxygen isotope stratigraphy denote Marine Isotope Stages. We correlated units of the Ryukyu Group and Marine Isotope Stages, assuming that a single unit was formed in response to a single cycle of glacioeustatic sea-level change and corresponding to deep‐sea benthic foraminiferal δ18O values. Dark-blue successions represent shallow-water reef deposits (mostly coral limestone) that have been altered by meteoric diagenesis to show reddish staining. They include the lower part of the Ryukyu Group on Irabu Jima and the Itoman Formation and its equivalents on Okinawa Jima 

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