253 
becomes reddish and turns to a fine-grained and sometimes 
porphyritic border facies. It sends numerous apophyses into the 
sandstone. These are reddish, fine-grained or dense, more or 
less porphyritic, and sometimes they show a strongly-marked 
flow structure. Their course is somewhat irregular, but they 
mostly run parallel to the bedding planes of the sandstone 
(this fact is only imperfectly shown on the diagram). Directly 
at the point of contact the sandstone beds have a sharp and 
rather irregular dip in an eastern direction, but already at a 
short distance from that point they become very regular, with 
a uniform incline of 33° to the east and 10° to the north. The 
entire thickness of the sandstone in this place is less than 200 
Narsarsuk lliortafik 
Zee = N Sea levels 
NE SW 
о 2 1 kilometer 
Fig. 22. NW—SE section of the plateau of Narsarsuk near the moraine at 
the entrance of Korok Fjord. — A basement granite; B sandstone; Bı sand- 
stone and hornfels; C augite-syenite. 
meters, and all the beds are greatly metamorphosed by contact, 
and consist of a white quartzitic rock with minor, but thick 
seams of a black hornfels rich in mica. The crest of the moun- 
tain is formed of white quartzite. 
During the field work it was thought that the sandstone 
was Iying in its original position in proportion to the old 
granite which is to be seen under it on the western side of 
the mountain, and the junction between granite and sandstone 
was not closely examined. However, doubt may arise as to 
whether the sandstone in the northern half of the Iganek 
Mountain (Fig. 21) represents the lowest sandstone beds deposited 
on the granite. This will appear from a comparison of the 
order of the strata in the two halves of the mountain divided 
