574 H. A. BROUWER 
nearly coincides with a, and the distinction between I a,-r, I a,-s 
and II a,-r, Il a,-s disappears. Between Rotti and West Timor 
(Fig. 7) II p-r may be represented, but the deformation of the 
horizontal projection is the only important one. 
The strait betweeh Timor and Rotti coincides with a bending- 
point of the horizontal projection of the geanticlinal axis. In 
seeking an explanation for the existence of this strait, we might 
suggest the pitch of the geanticlinal axis on both sides of the strait, 
while at the place of the strait the axis could disappear below sea- 
level. But if considered in detail, this explanation alone is not 
applicable. On Rotti we find between the main island and the 
peninsula of Landu a narrow strait which only recently has been 
& 
if Sar de y , I 
43 
POR 20 “OS 
CoP Sermatheiciatas 
\ Ee a 
0 
1 
ye. k y ae 
Landu ¢ Va 
ee 
2H 
Fic. 7.—I, Rotti, Timor, and the Sermata Islands. 470, etc., altitude of the upper- 
most reefs in meters. Straits and transverse dislocations are near the bending-points 
of II. II, Geanticlinal axis with bending-points between Timor and Rotti and between 
Timor and the Sermata Islands. 
. 
Rottl, yzo. 
filled up by a mud bank still inundated at spring tide. At both 
sides of the narrow strait high walls of elevated coral limestone 
occur, and during an exploration of the island I found a small 
isolated rock composed of coral limestone which emerges from the 
mud in the middle of the strait. These facts point to the existence 
of transverse gaping fractures formed by a movement with a com- 
ponent normal to the fracture plane. We have already mentioned 
similar facts in connection with the groups of small islands having 
high reefs. 
Another example of the same sort is found to the east of Timor 
(Fig. 7). Considering the large bendings only, a bending-point 
is located between East Timor and the Babber group; but if con- 
sidered in detail bendings of smaller amount may also be observed. 
We note a bending of the geanticlinal axis between East Timor and 
