575 
mutually complementary, and that the place of sudden curvature in 
the horizontal projection of the Tertiary folding-axes coincides with 
the considerable transverse dislocations of the present geanticlines *). 
One of the numerous changes which may thus originate in the 
horizontal projection is illustrated in fig. 2. 
Ftg. 2. One of the possible modes of genesis of deep transverse straits (such as 
Manipa Strait between Ceram and Buru). 
Suppose C, and D, of the horizontal projection to have reached 
C, and D, in a succeeding phase, then a rapid increase of opposed 
velocities will be engendered on either side of the point of intersec- 
tion, through which the breaking crust will reveal here in the first 
place considerable transverse faults and fractures. 
Let us imagine an ideal free horizontal movement without trans- 
formation of the geanticline, then all points will be displaced in 
horizontal direction with the same velocity. In case the free hori- 
zontal movement is counteracted, the places where considerable 
disruptions will occur near the surface, will be determined by the 
distribution of the velocities. 
The geanticline of the Timor-row of islands is situated at the 
island of Timor, opposite and near a fairly rectilinear part of the 200 
m.-line of the Sahul-shelf. The free horizontal movement is hereby 
counteracted in the same degree and there is no reason for expecting 
velocity-differences for adjacent points of the horizontal projection 
of the geanticlinal axis, so that important transverse faults and 
fractures do not occur. The central basin, however, that we now 
know to exist over the whole length of the Dutch portion of 
Timor and which is also found more towards the East, illustrates 
the occurrence of longitudinal disruptions, along which oppositely 
directed movements took place — at least for a considerable time 
during the development of the geanticline. 
1) These transverse movements may also have occurred in earlier. phases of 
mountain-building, but the present morphological structure is governed chiefly by 
the most recent movements along the same or other fault-planes and fractures 
of the same kind, which have taken over tlie task of the older ones. 
a 
