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de la publication originale. 
February 5, 1916. 
Canada 
Geological Survey 
Museum Bulletin No. 22 
GEOLOGICAL SERIES, No. 31, 
The Age of the Killarney Granite. 
By W, H. Collins. 
INTRODUCTION. 
In 1914, the writer began a study of the Pre-Cambrian 
formations in the district just north of Lake Huron, mainly with 
the intention of determining the geological succession there and of 
correlating it with the successions already worked out in other 
parts of northeastern Ontario. The principal results obtained 
during that season were published as Museum Bulletin No. 8 of 
the Geological Survey. The work was resumed last summer and 
a number of additional results pertaining to the geological 
succession in the district were obtained. A detailed report 
accompanied by maps, dealing with the work of both years, 
will be issued, but meanwhile it is proposed in this bulletin to 
present briefly and with less delay what appears to be the most 
important of this year’s results: the existence of granite batho- 
liths intrusive in the Huronian sediments. 
GEOLOGICAL CHARACTER OF THE DISTRICT. 
To introduce clearly the essential part of the paper it is 
necessary to begin with a review of the geological succession and 
structure. For a fuller treatment of this subject, the reader is 
referred to Museum Bulletin No. 8, in the series of publications 
to which the present article belongs. The geographical extent 
of the district to be dealt with is indicated in Figure 1. Within 
