47 
at the river on the north-east side of Kringlerne. Following up 
this river we first pass over uniform arfvedsonite-lujavrite, the 
partings of which have an inclination of about 30° towards the 
north. A little over 70 meters above the sea we begin to find 
in the lujavrite small, very flat lenses of kakortokite, 0°2—2°0 
centimeters thick; these lenses, which are rich in eudialyte, 
are inserted parallel to the parting planes of the rock. Upwards, 
the lenses become more numerous and about 80 meters above 
the sea the lujavrite is conformably overlain by the typical, 
sheeted kakortokite. Further to the west, where the kakortokite- 
body in Kringlerne swells up to more than 300 meters in thick- 
ness, there is apparently a gradual transition from the arfved- 
sonite-lujavrite to the superincumbent kakortokite; the lower- 
most portion of the kakortokite is fairly uniform at this spot, 
and the differentiation into differently coloured bands begins about 
10 meters higher up. Hence it follows that there cannot be 
any considerable difference in age between the lujavrite and 
the kakortokite; the latter must have consolidated simultane- 
ously with or a little earlier than the lujavrite. 
In judging the relative age it is also of interest, that the 
kakortokite, just like the neighbouring lujavrite, contains here 
and there lenses of naujaite. Four of these in all have been 
ohserved in the kakortokite of Kringlerne, the largest being 
50 meters long. 
The junction between the kakortokite and the augite-syenite, 
which surrounds Kringlerne towards the south and west, is 
finely exposed on the south shore of Kangerdluarsuk, almost 
right opposite the Niakornarsuk Peninsula. At this place the 
contact surface is vertical and has the direction N.55° W. The 
kakortokite sheets have an inclination of about 30° towards the 
N. 35° W.; they thus lie almost at a right angle to the contact 
plane. At a greater distance from the augite-syenite, the kak- 
ortokite is made up of the ordinary white, red and gray sheets, 
but about 50 meters from the contact the sheets begin to loose 
