574 
more connected originally. West-Moa, though just beside Letti, cannot 
be considered geologically as the prolongation of that island, and 
Kast-Moa, part from the young coral limestones, consists entirely 
of peridotite mountains, which are not found in West-Moa. The 
Island Luang consists of massive permian crinoid-limestones, not to 
be found in any of the other islands of the Sermata-group and are 
first met with in Timor, whereas the adjacent island of Sermata again 
seems to consist of totally different rocks, viz. phyllites and schistose 
diabase tuffs, such as also occur in Letti and in Kisser. Of course, 
these facts may be explained in part by an overthrust structure in 
the different islands. We still point to the northern situation of the 
island of Babber. 
A Cc. D, B, 
A, 
Fig. 1. Movement of a geanticline opposite re-entering angles of the 
“Vorland’’, as south-east of Timor. 
An example of considerable differences in velocity for adjacent 
points C and D of the horizontal projection of the geanticlinal axis 
is given in Fig. 1. 
The prolongation of the above-mentioned geanticline proceeds in 
a curve via Ceram and Buru. A very striking wregularity in the 
harmonic course of this portion of the geanticline is the narrow 
Manipa Strait, nearly 5000 m. deep between Ceram and Buru. The 
strike of the Tertiary mountain-range is, in West-Buru and in the 
greater part of Ceram, about N.W.—S.K. In West-Ceram and in the 
islands between Ceram and Buru N.E. strikes have been observed *). 
So the Tertiary mountain-range displays considerable curvatures from 
Ceram to Buru. 
We have pointed out before’) that the latest crustal movement 
in this region is considered by us to be a younger phase in the same 
process and an exact continuation of the Tertiary crustal movement. 
Of the Tertiary phase we only know the folds and overthrusts at 
greater depth, of the youngest phase only the fractured and faulted 
crust near the surface. We see, however, that the two phenomena are 
1) L. Rurren and W. Horz. De Geol. Exp. van Ceram 9e Verslag Tijdschr. 
Kon. Aardr. Gen. XXXVI 1919. 
*) H. A. Brouwer. On the Crustal Movements etc. l.c. 
