URL https://www.researchgate.net/profile/James-Reimer-2/publication/285236794/figure/fig63/AS:614375995998224@1523490060676/Simplified-geological-map-of-the-northern-part-of-Okinawa-jima-Island.png
URL2 https://www.researchgate.net/figure/Simplified-geological-map-of-the-northern-part-of-Okinawa-jima-Island_fig63_285236794
