HORIZONTAL MOVEMENT OF GEANTICLINES 567 
axis. In the present-day stage of mountain-building this fact is 
illustrated by the Timor-Ceram row of islands, where a well-marked 
culmination occurs in the central part of Timor and well-marked 
depressions are found to the east and to the west of it. Secondary 
culminations and depressions are also found. 
Sometimes two more or less parallel ranges of islands have the 
same direction as the geanticlinal axis. An example in the East 
Indian Archipelago is supplied by the islands of the Tenimber 
group, where the row which includes the main island Jamdena is 
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Maru2io 9 
25 
Laibobary rr Cee 
Wotanmic? 
Wulteru 
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ay 
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Fic. 3.—I, The islands of the Tenimber group. (Southeastern Malay Archi- 
pelago.) Scale 1:3,000,000. 225, etc., altitude of the uppermost elevated reefs in 
meters. II, The axes of the two secondary geanticlines (schematic representation). 
accompanied by another row including the islands Selu, Wuliaru, 
Wotar, Laibobar, Maru, and Molu. The latter row differs from 
that of Jamdena in that it consists of smaller islands, although the 
elevated reefs are known at higher altitudes. On Wotar they are 
found at an altitude of 225 m., whereas on the main island Jamdena 
of the southern row the greatest height is at most r50m. ‘The reef 
cap, which covers Jamdena nearly continuously, is asymmetric, 
rising gradually from the northwestern coast in the direction of the 
main watershed of the island and thence descending rapidly toward 
the southeastern coast. I have explored portions of the coast of 
