92 . LABRADOR 
before geologists to-day. It has been proved in certain fa- 
vourable localities that such schists are the result of the alter- 
ation of more ancient slates, sandstones, conglomerates, vol- 
canic ash, and lava-flows, under the same conditions as once 
obtained within the Archean range of northeastern Labra- 
dor. Here again is a wide field open to further exploration. 
The geologist who seriously studies these coastal rocks of 
Labrador, wonderfully exposed as they are, may some day 
establish new principles of interpretation, or confirm those 
now forming the basis of modern earth-science. 
During the paroxysmal though extremely slow growth 
of a lofty, alpine mountain-range, other changes of great 
moment occur in the deep, highly heated core of the range. 
The foundations of the huge pile areunloosed, and enormous 
blocks of the solid rocks are displaced by molten or 
thoroughly plastic matter, thrust up into the range by 
titanic subterranean force. There cooling, this material 
crystallizes into solid rocks of the granite type. As it 
crystallizes, the whole mass may be pulled out in the 
wrenching shear of mountain-building, much as soft pitch 
may be drawn out in the hands. In such a case the min- 
erals composing the new rock are arranged in lines, and not 
in planes, as in ordinary schists. An unusually fine example 
is exhibited on a large scale at Pottle’s Cove, West Bay, 
halfway between Belle Isle and Hamilton Inlet. The 
rock is there a common light pinkish gray granite possessing 
this curious arrangement of its constituents — a witness 
to the “storm and stress” period of Archean mountain 
growth. 
Late in the mountain-building period there occurred one 
of the most important underground events yet chronicled 
