255 
A more detailed investigation, however, will be necessary in 
order to decide the question. 
Narsarsuk. 
The augite-syenite with its usual fine-grained contact facies 
north of the Iganek Mountain borders directly on the old gra- 
nite, but the contact plane also inclines here towards the 
batholite, so that the margin of the augite-syenite lies upon 
granite. Sandstone appears again on the Narsarsuk Plateau. 
The sandstone beds at the direct contact plane incline towards 
the syenite at rather sharp angles (40°—50°). They are of a 
quartzitic nature, and alternate with beds of black hornfels rich 
in biotite, quite like the Iganek Mountain. But at a short 
distance west of the contact plane the sandstone strata are 
horizontal and of a more uniform nature, and they remain so 
for a long stretch to the westward. A good section of the 
junction between the sandstone and the augite-syenite is ex- 
posed in the steep wall at; the north coast of the Narsarsuk 
Plateau (Fig. 22), and quite a similar section is to be seen at 
the southern end in the steep rocky wall dividing the plateau 
from the low granite tract north of the Igaliko Fjord. The total 
thickness of the inclined sandstone strata in both places was 
found to be less than 200 meters. 
The occurrence of rare minerals attached to the border 
facies of the augite-syenite on the Narsarsuk Plateau is men- 
tioned on p. 244. 
Contact metamorphism of surrounding rocks. 
Where the wall of the batholite is made up of sandstone 
formations it has passed through an intense contact meta- : 
morphism. Rocks of this formation altered in a high degree 
are to be found along the margin of the batholite from the 
outlet of the Korok to the valley north of Tavdlorutit. The 
metamorphosed strata, especially on the Iganek Mountain, are 
