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by the volcanic series, in the Igaliko distriet only the lower 
part of the sandstone is to be found, and the upper strata of 
sandstone as well as the whole volcanic series have been worn 
away by erosion. The newer abyssal rocks are exposed over 
an extensive area. They constitute the large ‘‘Igaliko batholite” 
which occupies one third of the area lying to the north east, 
as shown on the map (Plate Ш), and most probably it extends 
far beyond the limits of the map. 
From a mineralogical point of view the Igaliko district presents 
a locality of the greatest interest, principally Narsarsuk at the 
western side of the foot of the Igdlerfigsalik mountain, where 
an unusually large number of rare minerals have been found. 
In the following description we shall treat, firstly the ba- 
tholite, its rocks (nepheline-syenite and augite-syenite), and con- 
ditions of contact, and secondly the basement-granite and the 
sandstone areas. 
IGALIKO BATHOLITE. 
The lofty mountains north, south, and east of the Korok 
Fjord belong to a large batholite which is indicated here as 
the ‘‘Igaliko batholite”. It mainly consists of nepheline-syenite, 
but in places where the junction between the batholite and the 
early rocks has been examined, it has been found that the ne- 
pheline-syenite is bordered by a narrow zone of augite-syenite. 
The eastern parts of the district being difficult of approach 
have not been surveyed’, thus it is impossible to indicate the 
extent of the nepheline-syenite area. The part of it which has 
been visited is the largest nepheline-syenite area in Greenland, 
! The author had but fourteen days at his disposal, of which he lost 
some on account of bad weather, for the geological surveying of the 
Igaliko district. Consequently the observations are incomplete in various 
respects. 
