Fig. 7From: 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 islandsGeological cross-sections through the Ryukyu Group on Irabu Jima and Shimoji Shima. The Ryukyu Group on the two islands is up to 100Â m in thickness and is divided into 13 units (modified from Sagawa et al. 2001) Back to article page