Co]^jper in the Animihie EocLs. — Laioson. 175 
<5opper isnotpeculiarto the Keweenawan series, butoccurs un- 
der somewhat analogous conditions in association with the Ani- 
mikie rocks, which underlie it, will be received with interest 
both by geologists and miners familiar with lake Superior. 
Such facts have come under the notice of the writer during the 
past season, and it is here proposed to give a brief account of 
them since it will be some considerable time before a system- 
atic report of the geology of the region can be published. 
Field occurrence r-^^ Along the west side of S. W. ^ Sec. 8. 
Con, VI. in the township of Blake, District of Thunder Bay, 
runs a north and south trending ridge which presents an 
abrupt escarpment about two hundred feet high facing the 
east. To the west of the brink of the escarpment the surface 
slopes gradually to the old Pigeon River road. The section 
exposed in the face of the escarpment is very characteristic of 
all the numerous similar escarpments of this portion of the 
country and consists of about 150 ft. of nearly flat lying 
black shales and thin gray siliceous beds of the Animikie series, 
capped by about 50 ft. of vertically columnar diabase trap, 
Near the south end of the quarter section, there is an inden- 
tation or bay in the face of the escarpment affording a steep 
slope whereby it may be ascended from the valle}' to the east. At 
the foot of this slope some Indian prospectors found some 
pieces of amygdaloidal traj) carrying native copper, which 
were brought to my notice at Port Arthur by Mr. C. Johnson, 
who had become interested in the find. In company with Mr. 
Johnson and his Indian guide I visited the ground last October, 
and found extending up the surface of this slope ad3'ke-like ridge 
of cupriferous amygdaloid. The surface had not been stripped, 
but was covered with soil, forest loam, brush, tree roots and 
moss. There were, however, four or five outcrops along the ridge 
from the bottom of the slope up to an elevation of 100 ft. 
These lay in a line which, by the compass, had a bearing of N. 
E. and S. W., which is the strike of the deposit provided it be 
a vertical attitude ; but this question cannot be determined till 
farther stripping and exploring has been done. If the deposit 
has a dip or hade, the true strike, which is of importance as a 
guide to further exploration, would have some other direction 
than N. E. and S. W. The outcrops show very clearly a width 
of at least 15 to 20 ft., though nowhere is the contact with the 
country rock exposed. The trap has a much more pronounced 
