AGE OF THE KH.LARNEY GRANITE. 
7 
point to point and upon the comparison of formational se- 
quences ; but both of these methods are likewise impaired by the 
numerous faults which have locally destroyed the former geo- 
logical continuity of the area. 
These difficulties were first seriously felt during 1914 in 
the vicinity of Blind River and Algoma. The sediments there 
stand nearly on edge and some diffidence was felt in correlating 
them with the nearly flat-lying Huronian formations not many 
miles to the north, especially as a great east-west fault was known 
to intervene. Before the close of 1914, however, all the rocks 
were satisfactorily determined except those which occupy the 
peninsula and southern bay of Lake Lauzon, and extend east- 
ward into territory unexamined at that time. 
These rocks are bounded on the north by a well-defined 
east-west fault, beyond which Mississagi quartzite rests upon 
pre-Huronian granite-gneiss. The fault effectively prevents 
correlation in this direction. The connexion southward is hidden 
by Lake Lauzon and Lake Huron. The connexion westward 
is obscured by soil covering; but in that din. ?tion lies a large 
area of Cobalt series, perhaps in continuity with the rocks in 
question. These rocks comprise a boulder conglomerate with 
fine-grained greywacke cement, a finely banded greywacke, and 
interbedded greywacke and quartzite, all in series. They 
closely resemble certain members of the Gowganda formation 
in the Cobalt series; in fact, no other suite of Pre-Cambrian 
formations just like them has yet been found along the north 
shore. This evidence, however, was not regarded as adequate 
for their sure identification. At the end of the 1914 field season 
it could only be said that, lithologically and in their order of 
succession, the rocks at the southeast end of Lauzon lake resem- 
bled part of the Cobalt series, but really conclusive evidence, 
such as a more extensive sequence of formations, or relationships 
to some other known series, was still needed. 
In 1915, it was decided to seek this confirmatory evidence, 
by tracing the debatable conglomerate, greywacke, and quartzite 
eastward. In pursuance of this plan they were followed in this 
direction for 12 miles, as far as Cutler. The fault on the north 
was found to persist the whole way, with Mississagi quartzite 
