807 



i^oimger, even tertiary granites are I'ecognised in the Moluccas or in 

 the neighbouring regions. 



Ad 8. 



Only few rocks are included by Verbekk among his group of 

 old-meso-voloanic igneous rooks. He deems it possible that part of 

 it still belongs (o the permian formation, while he emphasizes the 

 impossibility of settling the age-question. 



As regards the melaphyres of Timor, some of these rocks we 

 consider to be of permian age, to which view also Vehbkkk inclines '), 

 and which has also been established by our as yet unpublished 

 investigations of the Timor-Expedition led by Prof. Molenghaaff. 



These investigations also established the occurrence ot similar old 

 mesozoic rocks, while it is possible that a large part of the so-called 

 "old-mesozoic eruptive rocks" is of much later young-mesozoic 

 or tertiary age. To the latter belong for instance the melaphyres 

 with hyaline crust, quartz-porphyries and dacites of Timor's north 

 coast ; besides the latter rocks also serpentines, serpentine breccias, 

 serpentine conglomerates and tuffs occur. 



In our judgment, therefore, not only among the so-called "old- 

 basic-igneous rocks", but also among the so-called "old-meso-volcanic- 

 igneous of the Moluccas rocks occur of young palaeozoic, mesozoic 

 and probably also of tertiary age. 



Ad 4. 



Likewise the age of the young-meso-volcanic igneous rocks of 

 cretaceous (?) age has, according to Verbeek, not yet been ascertained. 

 Part of them he is inclined to include under his old-meso-volcanic 

 igneous rocks, others may even be old-tertiary. This group comprises 

 only andesites, dacites and acid melaphyres with bronzite of Ambon, 

 further andesites and dacites of the neighbouring islands ofHaruku, 

 Saparua and Nusalaut and of Western-Ceram, and finally horn- 

 blendepyroxeneandesites of Amblau and pyroxeneandesites with 

 vitreous crust of Wetter. Their being grouped together is due on 

 the one hand to their fresh appearance, whereby they distinguish 

 themselves from older rocks, while on the other hand they are 

 different from the East-Indian tertiai-y igneous rocks. 



In another paper*) we have described in detail that the points 

 of distinction from other tertiary igneous rocks are immaterial to the 

 establishment of the age. So, for instance, the enclosures of garnet 



1) R. D. M. Vekbeek. 1. c. p. 359. 



2) H. A. Brouwer. Geologische Verkenningen. 1. c. p, 34 seqq. 



