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covered surface of which is most unfavourable to investigation. 
But in the Igaliko district we meet with quite exceptional direc- 
tions of the fjords. Thus the main branch of the Tunugdliarfik 
Fjord here takes a direction N.—S., and the innermost end of 
the Igaliko Fjord'even runs from N. W.to S.E. In this region, 
therefore, practically all dykes intersect the coast lines, and are 
well exposed in the naked coast cliffs. 
All the dykes are almost vertical and very regular. The 
width of most of them varies from 5 to 10 meters, but numer- 
ous narrow as well as large dykes are to be found even up to 
a width of 50 meters. As we have already mentioned, the strike 
is about М. Е. and S. W. varying between N. 25° E.—S. 25° W. and 
N. 65° E.—S. 65° W. As a rule the dykes are a little more 
liable to decay than is the case with the country rock, and not 
seldom have they been the cause of the formation of picturesque 
eliffs. Still there are many exceptions to this rule. Near the 
abyssal rocks most of the dykes are intensely contact metamor- 
phosed. 
Rocks composing the dykes. — On the preliminary exami- 
nation of the dyke-rocks collected from the basement granite 
and the sandstone areas of the Igaliko district, the following 
types were found represented: 
diabase, 
monzonite-porphyry, 
augite-syenite-porphyry, 
hedrumite, 
nepheline-porphyry. 
sölvsbergite (?). 
Also a few very small pitchstone dykes have been found in the 
neighbourhood of Igaliko. 
When we compare this list with that of the type of dykes 
known from the Ilimausak territory, it will be noticed that 
quartz-porphyries which are so common in the last mentioned 
