136

explanation. The width of the area occupied by faulted and
broken ground has doubtless contributed to the error of former
investigators in considering that there were two seams at this
location. The bent and faulted dyke is evidence of the intrusion
of some of the dykes at least before movement had ceased. The
sharp differential folding of the lower part of the downthrow
section of the seam, where the 8-inch coal bench resting on the
floor is bent into sharp contortions, is also worthy of notice.

East of the Wawa Creek anticline there is a sharp canoe-
shaped syncline, with a north-south axis probably about a mile
in length, and an east-west axis that is thought not to exceed
300 yards. West of Wawa creek the measures are not well ex-
posed, but the general structure west to the high ridge near
Yakoun lake is a flat syncline, modified by low, undulating folds.
The approximate position of the outcrop of the coal bearing
horizon in this syncline is indicated on the map.

Camp Anthracite.

Location. Camp Anthracite is situated on the creek of the
same name, an eighth of a mile above the trail crossing, and
about a mile southeast of Camp Robertson.

Stratigraphic Position. Camp Anthracite is probably at
the same horizon as Camp Robertson, near the middle of the
Haida formation, but apparently nearer the base of the massive
sandstone of the upper Haida.

The opening is an adit on the right bank of the creek driven
for 45 feet across the measures. The roof of the coal seam is cut
at 12 feet from the portal, and at this point a drift goes 30 feet
southeast in the seam (Figure 18).

Coal Seam. The seam at Camp Anthracite bears a resem-
blance to the one at Camp Robertson, and is with little doubt the
same. It is 9 feet thick, perhaps thickened by minor
faulting, and contains several bands of coal, 4 feet 5 inches in all,
separated by bands of shale and bone. Next the floor there is a
4-inch layer of crushed coal, as in the case of the seam at Camp
Robertson. The roof is a medium to fine grey sandstone. The
seam is illustrated in Figure 19.