or 
or 
the newer abyssal rocks the granite is extremely resistant to 
weathering. 
At one place a small intrusive body of nepheline-syenite 
was observed, namely, on the east side of Iviangusat at an 
altitude of about 550 meters. Here there occurs a fine-grained, 
grayish black arfvedsonite-lujavrite, fairly poor in eudialyte; 
the rock is exposed over an ellipsoidal area of many square 
meters which is surrounded on all sides by the granite. 
The Iviangusat peaks and Kitdlavat are traversed by a 
number of dykes. The great majority of these may be called 
diabase from their macroscopic appearance. They are of a 
black or dark-green colour, and the larger of them are medium- 
grained with more close-grained marginal zones. The eastern 
peak of Iviangusat, for example, is traversed by several dykes 
of diabase, from 15 to 30 meters wide, which can be followed 
for kilometers through the granite; these dykes have not the 
usual north-west—south-easterly direction, which characterises 
by far the most of the larger dykes in the Julianehaab region; 
their direction is east—west and they have a dip of about 
60° towards the south. They are thus almost parallel with the 
adjacent boundary-plane of the large igneous complex. 
In Kitdlavat several dark-coloured dykes can be seen from 
a distance, running in a regular course parallel to this mountain 
ridge from N.N.E. to S.S.W., thus, parallel here also to the 
contact-surface of the granite and the augite-syenite. These 
dykes have not been investigated, it is probable that they form 
a continuation of the diabase dykes of Iviangusat. 
The huge mountain Kitdlavat (Pl. VII, Fig. 1) forms, as 
already mentioned, a serrated ridge of surprising narrowness 
and steepness. It seems reasonable to suppose, that the form 
of the mountain is due in the main lines to its proximity to 
the large nepheline-syenite body; Kitdlavat forms the south- 
east wall of the ancient magma reservoir. The diabase dykes 
have probably contributed in details to the mountain obtaining 
