301 
factor tending to enlarge the lower part of the batholite. 
Probably overhead stoping will not be possible on a larger 
scale without the co-operation of assimilation. Since the Ш- 
mausak complex of abyssal rocks represents the uppermost 
portion of a batholite it is not to be expected that it will 
show more than relatively small and local instances of assimi- 
lation. As mentioned above, such have actually been observed 
both in connection with the detached fragments and at the 
walls. 
The subsidence of the orographic blocks was only indirectly 
connected with the invasion of the batholite. — That there 
must be some kind of connection between the formation of the 
Ilimausak batholite and the faulting of the sandstone areas has 
been stated above, but it is also evident that the hypothesis 
suggested by Brüccer for the Christiania district’, viz. that the 
subsidence of orographic blocks was the direct cause of the 
intrusion, cannot hold good for a region like that of llimausak, 
where the place of the batholite coincides with the area of max- 
imum subsidence of the earth surface. The most probable 
supposition appears to be that the subsidence of the orographie 
blocks was directly connected with the volcanic activity at the 
earth surface and the formation of dykes and sills, and that the 
faulting only influenced the batholitic invasion in so far as it 
facilitated and localized the processes by which the more acid 
portion of the magma slowly began to move upward. Another 
factor which contributed to determine the localization of the 
batholite at the region of most intense volcanic activity, was the 
heating of the earth crust produced by the volcanic materials 
themselves. 
According to this view the batholitic invasion is in all 
essentials independent of the subsidence of the earth crust, 
while faulting, on the other hand, may have played some part 
1 W.C. BRÖGGER, die Eruptivgesteine des Kristianiagebietes II, 1895, р. 151. 
