778 
western direction, but we cannot find sufficient evidence to look in 
this direction for the continuation of the Timor-Ceram row of islands. 
Hotz’) reports the occurrence of rocks in the western part of the 
eastern peninsula of Celebes, which show a great resemblance to 
rocks, widely spread in Buru (Martrin’s Buru-limestones) while also 
the tectonic structure becomes more complicate than that of the 
eastern part of the east arm, where, as in the Sula islands, simpler 
tectonic relations prevail. This, however, does not convince us even- 
tually of a prolongation of our overthrust mountain-range. 
Curve with the young Volcanoes. 
The young volcanoes of the Banda Sea.are joined by VrrBrEK 
by an ellipse of which only one half embraces volcanoes, no volcanoes 
being known on the northern half between Banda and the Gs Api, 
north of Wetter. This ellipse runs concentrically with VrrBEEE’s 
elliptical “belt of older rocks’. In my opinion, we may as well 
assume that the volcanic islands rest upon a submarine ridge, which 
forms the continuation of the rows of islands to which Sumbawa 
and Flores belong, and which bends round considerably past Banda 
in the direction of the Siboga ridge with the Schildpad- and Luci- 
para islands and the G& Api to the north of Wetter. On this sup- 
position the Banda Sea would be encircled by two ridges, running 
concentrically wide apart, but the inner ridge bending sharply 
towards its termination. 
Additionally we are able to record here, that between the Timor- 
Ceram row and the row of the young volcanoes, another zone seems 
to exist with a certain autonomy. We mean a zone of older voleanic 
rocks, having many features in common and occurring near the 
north coast of Dutch-Timor, in Wetter, in Ambon and in the 
peninsula of Huamual in South-West-Ceram. Then a very consider- 
able portion of this zone would be covered by the sea. Among these 
voleanic rocks are serpentine breccias and serpentine conglomerates, 
tuffs, rhyolites, and andesites. Peculiar andesitic to basaltic rocks 
with glassy crusts, reminding us of the “pillowy lava” of Mullion 
Island and the upper-Devonian ‘“Wulstdiabase” of the Westerwald 
occur in all localities. Their typical structure is indicative of 
submarine origin; the origin of such structures was observed by 
ANDERSON?) where the lava of the new volcano Matavanu in Savaii 
5 W. Horz. Vorläufige Mitteilungen über geologische Beobachtungen in Ost- 
Celebes. Zeitschr. d a. geol. Ges. LXV. 1913. Monatsber. N°. 6, S. 329. 
2) Tempest ANDERSON. Volcanic craters and explosions. The Geogr. Journ. 
Febr. 19127 p. 129; 5 
