252 
Sections almost at right angles to the horizontal border 
line have been observed in three places: on the Iganek Moun- 
tain, and at the southern and northern ends of the Narsarsuk 
Plateau. The augite-syenite at all three places is bounded by 
sandstone, and the sandstone beds dip to the east under the 
syenite (Figs. 21 and 22). 
Mount Iganek. 
The mountain so called lies on the Igaliko Fjord opposite 
to Igaliko, and according to Steenstrup’s measurements it has 
an altitude of 562 meters. Its upper part consists of a quartz- 
itic sandstone greatly metamorphosed and very capable of re- 
WSW 
о 2 
1 kilometer 
N eer — == ыы en 
Fig. 21. ENE—WSW section of the northern part of Mt. Iganek showing 
junction of augite-syenite and sandstone. — A basement granile; B sandstone 
and hornfels; C augite-syenite. 
sistance to erosion. It is presumable that the augite-syenite 
formerly covered the top, and that the hard quartzile now pro- 
jects as a separate mountain on account of the rapid disinte- 
gration of the syenite. 
Through a fault (Pl. IV) the mountain is divided into a 
southern and a northern half. The southern part consists of 
sandstone strata dipping at an angle of about 8° to N.N. W., 
but the contact between these strata and the augite-syenite 
to the east is not exposed to view. A rivulet running north- 
ward has excavated a small valley north of the fault, and on 
the left side the contact is well exposed (Fig. 21). The augite- 
syenite at the bottom of the valley is of the usual gray and 
coarse-grained type, but at the contact with the sandstone it 
