112 Transactions. 
Banda arc. It is true that in the Kei Islands there are some shallow folds 
which trend from south-south-west to north-north-east parallel to the 
eastern part of the Banda arc, but they may be explained by a gentle 
tilt towards the Banda subsidence, and they do not indicate a chain o 
fold-mountains. e characteristic rocks of the Ceram-Buru line, 
and of the eastern end of the Timor chain, have not been recorded from 
the Kei Islands, which form the middle and essential part of the supposed 
Banda arc." Не therefore concludes that “the evidence of the Banda 
arcs does not accord with the view that they are situated along a 
meridional mountain-range belonging to the Alpine-Himalayan system and 
connecting the Sunda and Buru-Ceram lines. The Kei Islands, the central 
part of the Banda arc, are built of materials that were deposited in the 
same basin as southern New Gui uinea. The foundation of these islands 
was folded in the late Eocene or Oligocene by the same meridional com- 
pression that formed the mountain-lines which occur both to the north 
and south of them, and extend past them both to east and west. This 
compression was part of the crustal movement which formed the mountains 
of the Alpine and Himalayan systems and also the fold-mountain chains 
of New Guinea. After the formation of the fold-mountain belt in the 
Weber Deeps, and cross-fractures broke up the land into islands and 
separated the Molucca Islands from New Guinea. These earth-movements, 
in accordance with the evidence so well interpreted by Professors Molen- 
graaff and Brouwer, are probably still in progress; they have been very 
uneven, subsidence having occurred in one place while uplift was in 
progress elsewhere " (Gregory, 19234). 
In opposition to this conclusion may be cited the verbal comment of 
Professor Brouwer that as a result of laboratory investigation of his 
collections from Jamdena it now appears that much formerly assigned 
to the Tertiary should be relegated to the Mesozoic; and, considering 
the strike of these formations as well as of those previously held to be 
Mesozoie, it would appear that the balance of the very varying direction 
of strike lies more nearly meridional and in the direction of the Banda are 
than at right angles thereto; and, further, the lines of strike shown by 
Professor Gregory running eastwards to east-south-eastwards through the 
— south of MacCluer Gulf do not take note of the very sharply 
rked deflection to the south-east which actually occurs here, and 
ede to be concentric with the Banda arc, and to run thus for a short 
distance before DM back to the east-south-east along the line of the 
Snow Mountain 
In support of his view Gregory cites the comment of Suess (1908, 
p. 237) that “ we might regard the whole zone of the Tenimber, Kei, and 
Watubele Islands, together with Ceram and Buru, as resting on an arc- 
shaped horst, and this would be separated on the north by a trough 
subsidence from New Guinea, Misol, and Obi "—though ws is = from 
a later remark (p. 243) his ам is to look on Cer B 
as the continuation of the southern peninsula of New unen: as does 
Professor Gregory. Professor David (1914) is cited in further support 
thus: "[Papua]is part of the Himalayan-Burmese arc prolonged through 
the Malay Peninsula, Sumatra, Java, and Timor. Its trend-lines are 
continuous "id those of the Malay расак [? Archipelago], and the 
