‘mack. — = 
CRYSTALLINE SCHISTS OF THE EAST COAST. 401 
ip 
In another place’ the same writer gives a section of the “conglomerate 
or pebbly slates” of the Huronian “exposed at the mouth of the river 
Doré, near Gros Cap, about five miles above the mouth of the Michipicoten 
River.” The section measures some 1,700 feet. A further thickness, not 
measured, is said to underlie this at this place. ‘The strike of the rock is 
very regular, being about east and west, while the dip is very highly in- 
clined, the beds being not more than from ten to fifteen degrees from a 
vertical attitude; but the slope is for part of the distance to the north, and 
for the remainder to the south; there is not, however, supposed to be any 
repetition of the measures, * * *.”' Ihave not been able to find any 
thing further of interest in the present connection with regard to the schistose 
rocks in the neighborhood of Michipicoten Island and River. 
In the extreme northeastern corner of the lake, in the region of the 
Pic River, are again rocks as to the Huronian age of at least some of 
which there can be no doubt. Logan and Bell have described these rocks. 
Logan even doubtfully refers part of them to the copper-bearing series, 
though he maps all of them as Huronian. He says: 
They occupy the coast for about seven miles on each side of the New Pic River, 
while an interval from this to a point two miles beyond the Old Pic River, including 
the coast of Peninsula Bay and Harbor and Pic Island, is composed of trap. Beyond 
this the chloritic slates occupy about fifteen miles of the coast, extending to the neigh- 
borhood of the deep cove which receives the Pike River. It appears probable that the 
slates thus flanking the trap on either hand may be the sides of a trough converg- 
ing to a point inland, the distance of which from the coast has not been ascertained. 
The Slate Islands are nearly on the strike of the northwestern side of the trough, and 
they may probably derive their name from being composed of slate rock;—but the 
islands have yet to be examined.' 
With regard to the trap, Logan says in another place: “In a straight 
line across from one side to the other on the coast, it occupies a space of 
about fourteen miles. No rocks of a sedimentary character have been 
observed to be associated with it; but its stratification is very distinctly 
marked, with a dip southwesterly of about twelve degrees. Its character 
differs in different places; but no portion of it was observed to be amyg- 
daloidal, except one bed, which exhibited a transverse columnar structure.”* 
1Geology of Canada, 1863, p. 53. Geology of Canada, 1863, p. 80. 
2Geology of Canada, 1863, 63. 
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