04 B. KOTO : THE GEOLOGIC STRUCTURE OF 



seems to be represented by the genus Pseudomontis. The Liassic 

 and Oolitic fossils of Rotti are represented by Arietiies geome- 

 tricus, Harpoceras cf. eseri, and Belemnites gerardii. Sawn is 

 geologically like Rotti. I know nothing about the literature 

 concerning the geology of Ombaai, 



The islands Sumba, Timor, Ombaai, and Wetter are remark- 

 ably free from volcanoes, though situated amidst the chains of 

 extravasation of subterranean magma. They intervene between 

 the belts of Banda and Sunda, from which we might without 

 hesitation conclude that the two constitute independent series. 

 On this account, Timor is sometimes looked upon geologically as 

 one of the South-west Islands, at other times as a prolongation 

 of the South-east Islands, of the Banda group. After all, Timor 

 and Sumba have not yet got, geologically speaking, their position 

 as true members of the Malayan Archipelago, and they are 

 sometimes even spoken of in connection with Australia. 



Be that as it may, the Banda chain of volcanoes, already 

 referred to, is circumscribed exteriorly by the similarly bending 

 series of the South-east Islands which begins either from Kisser 

 or Letti. We will now follow it. 



Kisser seems to be a mere cliff of crystalline schists, sur- 

 rounded by Tertiary and Kecent coral-reefs, while Letti consists 

 of rolling hills of Miocene sandstone and marl, with an east- 

 west strike, underlaid by old schists. Moa is a little larger, and 

 geologically somewhat exceptional. A lofty peak like Teneriffa 

 stands on the east coast and is believed to be an extinct volcano, 

 while the low-lying tract consists essentially of coral limestones. 

 As the next island in the series comes Lakor, which is a mere 

 coral limestone. Luang consists of marls and sandstones (Ter- 

 tiary?), fringed with coral islands; the same should be the case 



