87 
even at a long distance. The original structure is usually well- 
preserved in this red naujaite, but the dark-coloured minerals 
and the sodalite are replaced by soapstone-like or chloritic 
aggregates, and the felspar is filled with ferric oxide and fre- 
quently zeolitised. Thus, we have here a similar local alteration 
to that found N. W. of Nunarsuatsiak. 
The arfvedsonite-granite forms a sheet of considerable 
thickness above the nepheline-syenites. It occupies an area of 
irregular but roughly circular form, a little more than four kilo- 
meters in diameter. As mentioned earlier (p. 70), it has origi- 
nally extended over an area several times larger, namely, right 
over to the other side of the Tunugdliarfik Fjord. At North 
Siorarsuit the transitional zone between the arfvedsonite-granite 
and the underlying nepheline-syenite lies at a height of about 
400 meters; from here it rises towards the north and close to 
the south of the Narsak Glacier reaches a height of almost 
1100 meters. This corresponds to an average inclination of 
about 11° towards the south, but in reality the transitional zone 
is bowl-shaped and the inclination is steepest in the northern 
part. The thickness of the arfvedsonite-granite sheet can be 
estimated at about 300 meters. 
The general appearance of the arfvedsonite-granite has been 
described above (р. 81). The colour of the granite in the 
higher part of the region is usually light-greenish, but reddish 
varieties have a considerable extension; at a few places (in the 
narrow ridge south of the Narsak Glacier at a height of 1000— 
1100 meters and close to the south-west of Hatten at 760 meters) 
there is found a variety of a strong red colour; this variety is 
filled with secondary fluorite and micaceous hematite. 
Within the area shown on the map (Pl. Ш) as arfved- 
sonile-granite, syenite has been observed at two places. The 
one place lies almost in the centre of the granite area, at a 
height of 650—720 meters south-west of Hatten; here a white 
syenite is found, in part very closely related to the augite-syenite 
