294 
a primary igneous contact, and the Plutonic rock exhibits an 
ordinary border facies and sends out apophyses into the 
country rock. It is notable that the remnants of the flat roof 
consist entirely of volcanic sheets (porphyries) and that the 
batholite has not only traversed the entire sandstone forma- 
tion but also penetrated a large part of the volcanic series. 
Section A—A. 
ILIMAUSAK 
KITDLAVAT 
Sermilik 
m 
Tunugdlarfik 
Section C—C. 
NUNASARNAK 
D» 
р 
р 
Tunugdliarfik 
Fig. 27. Three cross-sections of the Ilimausak batholite. 
Scale about 1: 150000. 
g Algonkian granite. — s sandstone. --- » voleanic sheets. The rocks of the batholite 
are given in black. The position of the section is indicated on the map, Fig. 28, 
To the reconstruction given in Fig. 26 (p. 290) it might be 
objected that we cannot know whether the upper contact has 
been, on the whole, of the same kind as that observed with the 
small remnants of the cover now constituting the two southern- 
most peaks of Ilimausak. This, of course, is true: but on the 
other hand the observed dip of the strata all round the batholite, 
and the regular sheeted structure of the batholite itself strongly 
support the view that the whole upper contact surface was 
