80 
reddish spreustein which indicate the original presence of nephe- 
line in small amount; it also contains two or three horizontal 
pegmatitic veins, but a few centimeters broad, which consist of 
felspar and nepheline. The upper beds of the pulaskite, with 
a total thickness of about nine meters, are devoid of nepheline. 
In the lower beds of the quartz-syenite, quartz is only present 
in very small amount and is only seen under the microscope; 
in the upper beds quartz is easily seen with the naked eye. 
The quartz-syenite has a thickness of about 16 meters and is 
covered by the arfvedsonite-granite, which is rich in quartz. 
Nearest the quartz-syenite the granite is of a light grayish-red 
colour and a little variable in size of grain, coarse-grained and 
medium-grained varieties alternating in indistinct, horizontal bands. 
As indicated in the above scheme, the upper part of the 
transition-series is of a red colour. This is due to an alter- 
ation of a similar kind to that in the red zone in the moun- 
tain north of N. Siorarsuit (p. 78); but in the transition-zone 
the process has not been carried so far and has everywhere 
left the felspar unchanged. 
The junction of the nepheline-syenite with the superincum- 
bent arfvedsonite-granite has proved to be of the same character 
at the other places where it has been closely investigated, but 
the thicknesses of the different transition-sheets are variable. 
A second example of the transition series may be given, as 
found about two and a half kilometers W. $. W. of the place 
just described, at an altitude of about 600 meters near Igdlun- 
guak. Here the transition-sheets have a dip of almost 20° to- 
wards the north or north-west and the succession is the fol- 
lowing: 
Arfvedsonite-granite, light greenish; 
Pulaskite, white, 10—15 meters; 
Not exposed, 2 meters; 
Sodalite-foyaite, ca. 1 meter; 
Naujaite. 
