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36 B GEOLOGICAL SURVEY OF CANADA

brook, still on the same course, another stream is crossed, which flows past
the eastern side of Mount Htheline and enters the East branch 9f Yakoun river
a short distance from the lake. In this also the outcrops, similar to those on
Falls brook, are apparently quite regular, but approaching the mountain which
is of the older igneous rock, the measures become somewhat disturbed. To
the north of Mount Etheline considerable areas of peaty land occur, with

small pools and scrubby timber.

From this place an ascent of the mountain was made on the east flank.
It is composed for the most part of very hard rubbly, greyish weathering
felsite, somewhat flinty and occasionally with a banded structure. It is a
part of the underlying Pre-Cretaceous series of the island, or what has been
styled, by Dr. Dawson, the ‘‘ Vancouver series.’? The elevation of this

mountain is 2,540 feet above sea-level, by aneroid.

From Camp Robertson to Yakoun lake is about three miles, the descent
in this distance being 640 feet, so that the elevation of the lake should be
210 feet. The geological features of this lake basin have already been
stated. On the trail, several creeks are crossed where ledges of the usual
grey sandstone outerop, the dip in the larger creek midway being N. 20° E.
< 10°-12°. The rocks in this area are not steeply inclined.

Returning to Falls brook, one mile southeast of Robertson camp, the
sandstone and shale in broad, nearly flat edges extend down the stream
for some hundred yards and, in places, show the presence of shells and
plant stems, At about 300 yards below the trail crossing there is a fall of
forty-five feet over well bedded sandstone with a dip of S. 65° W. < 8°,
interbedded with grey shale. This is the usual character of the coal-

measure sandstone throughout the district.

A good section of the rocks near the camp is afforded on a small
branch of the East Yakoun stream which flows past the camp. The
openings here on the main seam consist of several shafts and tunnels
which will presently be described, and the containing rocks are greyish
sandstone and shale both grey and black. About ten chains east of
the camp, a large bank of crushed black coaly shale is exposed, suc-
ceeded down stream by sandstone and shale, also somewhat disturbed,
but with a general dip of S, 30°-40° E. Two brooks join the stream
from the south near this point, both of which flow to the west of the
high ridge which lies to the southeast of the camp. These both show
outcrops of the ordinary grey sandstone.

The rocks along the lower part of this stream are very much broken

up. Intrusions of igneous rocks are frequently seen and _ several