265 
ment is not known here, but most likely it is far less than on 
the Iganek. 
DYKES. 
The perceptibleness and frequency of the dykes is one of 
the most striking peculiarities of the Igaliko region, as it ap- 
pears to the explorer who visits the inner distriets of the Tu- 
nugdliarfik and Igaliko Fjords for the first time. More or less 
parallel dark bands or lines are to be seen nearly everywhere 
on the surfaces of the basement granite and sandstone moun- 
tains, and it is often possible, whilst sitting in a boat on the 
fjord, to follow them with the eyes for a distance of several 
kilometers. Actually the Igaliko district offers a splendid op- 
portunity of studying a large collection of genetically related 
dykes. The time we had at our disposal during the field work 
was, however, not sufficient for any systematic study of them, 
and here we will only give a short report of what seem to be 
the main features according to the observations at hand, and 
we will leave several questions open concerning the dykes. 
General features. — The dykes in the basement granite 
and the sandstone of the Igaliko territory in their general re- 
lation show a considerable correspondence to those of the Ш- 
mausak region. In both territories the most frequent type is 
a reddish-brown syenite-porphyry; the direction of the dykes is 
almost identical (N. E.—S. W.), and it is not impossible that 
some of the individual dykes, on subsequent investigations, will 
be found to extend in connection from one district to another. 
The dykes of the Igaliko region are much easier of approach 
than most of those in the Ilimausak territory. This is due to 
the fact that the fjords run in varying directions. In the Ili- 
mausak district they run almost from N. E. to S. W. following 
the general rule as regards the fjords in this part of Greenland. 
Consequently the dykes are parallel to the coasts, and many of 
them are only to be looked for on the lofty plateaus, the débris- 
