38 AKT. 2— S. YOSHIWAI.'A : 



the Palaeozoic rocks such us clay slate, sandstone, [nroxeiiite or aiiiphi- 

 bolite, compact quartzite and limestone, ajid the iuneoiis rocks, 

 granite, diorite, diabase, andésite, propylite, (piartz-porphyry and 

 liparite, besides less extensive Tertiary sediments ajid raise(î reefs. 

 The interior, with the exception of the table-land composed of reefs, is 

 mountainous. The highest peak, Omoto-dake. rises 1()80 ft. above 

 the sea-level. The greater part of Iriom<^te-jinia, another large island 

 in the Yaeyania subgroup, is composed «^f Tertiary sediments, with 

 Palaeozoic sediments only on the north-eastern corner, and raised reefs 

 at vîu'ious places. The whole ishind with the exception of the very 

 limited occurrences of raised reefs is mountainous. The highest peak, 

 Goza-dake, has an elevation of about 1500 ft. above the sea-levle. 

 The interior is entirely uninhabited on account of the presence of a 

 terrible fever and poisonous snakes. People are living on the <;oast^ 

 and maintain communication Ix'tween tlieir villages chiefly by means 

 of small dug-out canoes. Oidv a few persons have succeeded in cross- 

 ing the island from its northern to its southern coast. This is a journey 

 of only fourteen miles, but it takes at least three or four days. The 

 three islands, Kayama-jima, Kobania-jima and Taketomi-jima, lying 

 between Iriomote-jima and Ishigaki-jima. lia\ c Palaeozoic sediments in 

 the interior and make the ccjnnecting link between these tvro lai-ge 

 islands. 



Pabi'ozoic Rocks ()f Js]ii<jaki-jiiii((. This island trending in a ?s K 

 direction, shows two very narrow isthnuises of recent formation in its 

 northern part. Also the western peninsula (15 in PI ITI) is connected 

 by a plateau of raised reefs Avith the juain Ixxly (A) of the island. 

 Thus the island, at the time of the formation of the ancient reefs, was 

 probably four separate islets, A, P>, (■ and 1). ('la\' slate, sandstone, 

 and pyroxenite or amphibolite are found in P>, C, D and in the eastern 

 part of A. Compact quartzite, with v(^ry thin intercalations of other 



