781 
dition of the Western Alps in their development in the Jurassic 
period, as described by ArGanp'). Also here we see two geanticlines 
and a “Vorland” separated from each other by geosynclines. In the 
liias the formation of the geosynclines and geanticlines is more 
accentuated, which continues down to the middle-jurassic, the gean- 
tielines above the sealevel having disappeared. In the Upper-Jura 
this is followed by a moderate submersion, after which in cretaceous 
times the intense crustal movements begin, which reach their maxi- 
mum in the tertiary period. The overthrust sheets moved in the 
direction of the “Vorland” and eventually were pushed over it; the 
sea-basins of the anticlines are moving down gradually and at last 
disappear altogether. 
Oscillations, such as occurred in the jurassic period in the Alps 
and to which we have alluded above, are also known to us in the 
curving rows of islands in the Moluceas. The formation of the 
overthrusts was followed by a long period of denudation, then a 
submersion and deposition of sediments, which was followed again 
by upheaval above the sea-level. 
SUMMARY. 
The outwardly directed overthrusts to be observed everywhere in 
the Timor-Ceram curve mark the action of a tangential pressure, 
which caused the sediments, deposited in this region in mesozoic 
and tertiary until the beginning of miocene time, to be pushed in 
the direction of the “Vorland” and to be raised above the sea-level. 
The subsequent submersion may be accounted for by a temporary 
decrease of the intensity of the tangential pressure. The character- 
istics of the now appearing rows of rising islands and of the 
alternating sea-basins point to a recurrence of the crustal movements 
and do not clash with the assumption that these movements occur 
again in the direction of the ‘‘Vorland” and that consequently the 
rows of the uplifted islands indicate the spots where at greater depths 
the folding process continues with a tendency to form overthrusts. 
In this connection we refer once more to the outlying position of 
the Kei-, and Tenimber-Islands opposite the depressions of the “Vor- 
land” and the stronger uplift of the northern part of Groot-Kei. 
As the movements proceed the uplift of the rows of islands (with 
alternate intervals of temporary subsidence through decrease of the 
intensity of the tangential forces) will be accompanied by a shifting 
') E. Ancasp. La formation des Alpes occidentales. Eclogae Geol. Hely. Vol. XIV, 
1916. Pl. 3. 
