802 



When testing the above hypotlietioal consideiatioiis to the recent 

 cnistal movements in the region discussed, it appears that during 

 these movements in the outer row of islands the niagma has not 

 readied the surface on the top of the geanticline. It is possible, 

 however, that also there tangential pressure has -revealed itself — 

 anyhow initiall\' — bv folding without an} breaking of the strata. 

 So far as the present geological data enable us to judge, the same 

 applies to the island of Wetter, close to the outer row of islands. 



The volcanic rocks occurring along the inner margin of the row 

 of islands i.a. in the north of Dutch-Timor and in Ambon'), are 

 anterior to these crustal movements and peihaps were evolved by 

 the anterior folding, which culminated in the miocene period. In the 

 inner row of islands older but also joung-volcanic rocks are found 

 to a vast extent. 



Volcanic action continues into the present time, but seems to 

 extinguish gradually after having been intensified most likely with 

 the renewal of the crustal movements. The volcanic activity was 

 more prolonged consequent on a progressing distance from the outer 

 row of islands, ami from the "Voorland". 



It would seem legitimate to assume tiiat the folding movements 

 weie of the character described first in those parts that were nearest 

 to the "Vorland", whereby the connection of the magma with the 

 surface was broken. We refer to the above mentioned more complete 

 adaptation of the outer row of islands to the configuration of the 

 Vorland. The sanie will be the case in the islands east and west 

 of Wetter, of the inner row, if the folding forces and the accom- 

 panying movements persist in the direction of the "Vorland". We 

 see in the inner row of islands of the South eastern Archipelago 



an instance of e.rtinction of volcanic activity on the top of the ge- 



' * 'I'll' 



anticline durinq a renewal of the viountain bnildmg pwcess. 



1) Ibid. Geol. verlienningen in de oostelijke Molukken. Feestbundel Prof. Dr. G. 

 A. F. MoLENGRAAFF, Verb. Geol. Mijnb. Gen. 1916, p. 38. 



