566 H. A. BROUWER 
a normal evolution, high reefs will always be found on large 
islands. 
If this is not the case, and if adjacent small islands show ele- 
vated reefs at high altitudes, this points to the existence of frac- 
tures. This case is illustrated by the islands of the Babber group 
(Fig. 2). Some fine specimens of terraced islands are found in this 
group. In Babber the uppermost elevated reefs are found at an 
altitude of 650 m.;* the small island of Dai with a steep coast has fif- 
teen terraces, the highest at 620 m. above sea-level; the small island 
= of Dawera has probably six- 
oooh, ie teen terraces; and Daweloor 
é lawera, 328 has fourteen entirely covered 
ee. “Shaweloorl with reefs. On Dawera the 
Baier es highest point is at an alti- 
~t : tude of 328 m., and on Dawe- 
IMaseta, loor of 280 m. On Wetan, 
i which also consists entirely 
ee ne of upheaved reefs, there are 
“Cag six or seven terraces in the 
Fic. 2.—The islands of the Babber group. 
(Southeastern Malay Archipelago.) Scale 
1:3,000,000. 320, etc., altitude of the upper- 
most elevated reefs in meters. 200, 500, 
1,000, submarine contours in meters. 
southern part with a maxi- 
mum altitude of 320 m. 
Wetan is separated from 
Babber by a narrow and 
deep strait without reefs.’ 
Kisser, a small island of the Sermata group shows the same char- 
acteristics, having a fine terraced appearance with the highest reefs 
at an altitude of 147 m., though in the neighborhood of its coasts 
the sea bottom falls off rapidly to great depths. 
THE EVOLUTION OF PARALLEL ROWS OF ISLANDS AND LONGITUDINAL 
FRACTURES STUDIED IN THE PROFILE 
If we consider the evolution of geanticlines in a direction parallel 
to the geanticlinal axis, we find long and high islands where they 
are highest, and small and low islands at the depressions of the 
tF. A. H. Weckherlin de Marez Oyens, ‘‘De Geologie van het Eiland Babber,” 
Handel. v. h. XIVe Nat. en Geneesk. Congres 1913, pp. 403-68. 
2R. D. M. Verbeek, op. cit., p. 458. 
