^2 ART. I. -S. YOSHIWARA: 



Kuro-shiina 20—30 ft. 



Ike-jima about 100 ft. 



Tarama-jima 105 ft. 



Kita-öagari-jima 150 ft. 



Kasa-jima 150 ft. 



Hateruma-jima 220 ft. 



Minami-öagari-jima 250 ft. 



Irabn-jima less than oOO ft. 



Miyako-jiDia 378 ft. 



Shimajiri (in Okiiiawa-jiiiia) 600 ft. 



Kikai-ga-shima C84 ft. 



The two islands between 600 and 700 ft. in height, namely 

 Kikai-ga-shima and Okinawa-jima, are composed of foundation rocks 

 capped with thin reefs. All the other islands are of coral formation, 

 with other rocks hidden under the sea. Their heights are however too 

 great to admit of an explanation of the origin by the Elevation Theory. 

 But according to F. Dahl who maintains the Depression Theory, the 

 reefs of the l^ismarck Archi|jelago show the very great height of 300 

 metres, just as in the case of Miyako-jima and others. According to 

 E.C. Andrews, most of the raised reefs of the Fiji islands have been 

 elevated from 800 ft. to 1050 ft. above the sea. The reefs in Timor 

 which are considered by K. Martin as belonging to the Diluvial epoch, 

 attain the lieight of about 600 metres. Those in north Luzon which 

 belong to Pliocene were upheaved even to the height of 1400 metres. 



The foundation of the raised reefs consists of Tertiary and Palieo- 

 zoic sediments as well as igneous rocks. In the Saki-shima group, 

 the reefs lie upon inclined Miocene rocks: in the Okinawa group upon 

 still more recent Tertiaries. In the Kiukiu Curve, the raised reefs are 

 covered only by the weathering product of the reef, and by no younger 

 deposit. The loose sand resembling a Diluvial deposit is mostly found 



