22 



ART. 2,- S. YOSHIWARA 



The hiîrli mountains in tlie interior consistino^ of Paleozoic rocks and 

 plutonics, are surrounded by a vast plateau of Diluvial reefs, which is 

 especially extensive in tlie southern part. The highest peak is Ino- 

 kawa-dake Mdiich rises :2207 ft. above the .sea-level. The Palœozoic 

 rocks are chiefly clay slate, the same as that in Oshima. Sandstone 

 and quartzose sandstone are not uncommon, but pyroxenite or amphi- 

 bolite is rarely found. Compact quartzite was never observed even in 

 the form of fragments. All tliese rocks are regularly folded, but show 

 several disturbances in contact with the plutonics. 



