230 
and most probably it is one of the largest in the world, for as far 
as can be judged according to the topography and the aspect 
of the mountain slopes regarded from a distance, the nepheline- 
syenite is continued very far to the east, and in all likelihood 
it extends under the inland ice. 
The general appearance of the Igaliko batholite mountains 
differs from that of the Ilimausak batholite. They are higher 
and steeper. Boldly and precipitously they tower above the sea, 
and attain to large altitudes, there being, as a rule, no beach. 
It is obvious from the shape of the mountains that we are here 
closer to the inland ice, so that the erosion which is due to 
the fjord-glaciers has been maintained until quite recently. The 
mechanical disintegration of most of the rocks in the Igaliko ba- 
tholite is not as conspicuous as this phenomenon at Kangerdlu- 
arsuk and Ilimausak, and vegetation is frequently found on the 
lower part of the hills. Upon the whole, however, the decay of 
the Igaliko batholite must be characterized as relatively rapid, and 
in several places it determines the appearance of the mountain 
slopes. In this respect they differ considerably from the compact 
and hard sandstone rocks in the west, and the old granite north 
of the batholite. The contrast is less apparent at the south 
border, where, singularly enough, the old granite in the Tav- 
dlorutit mountain is covered with screes to almost as great an 
extent as is the case with the syenite on the opposite side of 
the valley, and looked at from a distance the rocks might be 
supposed identical. Therefore earlier explorers have attributed 
to the syenite a larger extent than it really has. 
NEPHELINE-SYENITE OF THE IGALIKO BATHOLITE. 
The bulk of the Igaliko batholite, as far as is known, con- 
sists of nepheline-syenite. Seen from a distance the colour 
of the rock is reddish; sometimes it is intensely red like that 
at Angmagsivik or grayish as in the southern part of the 
