42 



ART. 



-S. YOSHIWAßA 



Slate and sandstone. 

 Compact qnartzite. 



Compact qnavtzite. 



Alteniatious of compact qnartzite and sandstone, 

 andstone. , 



Taliuozoic limestone found at Ishizoko and its environs has the 

 strike E-W, and is crystalline being identical with that of the Üshima 

 and Okinawa groups. 



There are three small islands (Taketomi, Kobama and Kayama) 

 making a connecting link between Ishigaki-jima and Iriomote-jima. 

 The eastern island Tahetomi-jiiita is a flat table-land; its northern half 

 is compact quartzite with .sandstone and clay slate, while the southern 

 half is entirely built of raised reefs. The Paleozoic rocks have the 

 strike E-AY, X70°E or X80°E, and the dip N30°— 65°, NW35°— 

 40°, just as on the opposite coast of Ishigaki-jima. 



The princi]jal part of Kohama-jinm, lying on the north-west of 

 Taketomi-jima, is composed of Palaeozoic pyroxenite, sandstone and 

 clay slate with the same strike as in Taketomi-jima, but Avith the dip 



S or 8W '2{f- 40". 



The smallest island, 

 Ka7jaiiia-jniia, whose tectonic 

 condition is shown in Eig. G, 

 is chiefly composed of 

 pyroxenite with a very limit- 

 ed occurrence of compact 

 quartzite. Ihese are inclined 



Fig. 6.-Goe]ogical Map of KayauKV-ji.na. ^O SW Only On the WCStcm 



