131

a thickness of 6 inches. The roof of the seam, like the floor, is
of grey, fine to coarse, massive clay shale.

About a quarter of a mile west of Camp Robertson and a
few yards south of the trail to Yakoun lake, thin seams of coaly
shale are exposed in the south bank of Wawa creek. These
seams are of no value in themselves, but serve to illustrate the
tendency for coal to form when these measures were being laid
down. Figures 15 and 16, froma sketch by Mr. Milnor Roberts,
show the relations of these coaly seams.

Analyses of the coal from the Robertson seam are given
below. The samples collected by the writer were carefully
taken, and material that could be rejected by hand picking in
mining operations was not included in the sample.

a SE
Se, La
Sha/E 10" LE

FE
Co

Scale of feet ;

bical Survey, Caagea.

2

G 20/9,

Figure 15. Vertical section through A—A’ on right wall of open-cut (see
Figure 16), looking north 70 degrees west. Illustrates typical
occurrence of glacial drift resting on cleanly eroded surface of bed-
rock. Nocoal blossom is found in the drift material near the
outcrop of the seam.