INTRODUCTORY. 



Through the courtesy of W. F. King, C.M.G., LL.D., B.A., D.T.S., Chief 

 Astronomer, Department of the Interior, the Geological Survey is enabled to 

 publish this Memoir. The field work was done under, and at the expense of, 

 the International Boundary Commission, and appears as an appendix to the 

 report of Mr. King, the Canadian Commissioner. As the report constitutes a 

 most important contribution to the geology of western Canada, and as in its 

 ' Blue Book ' form it would not be available for many libraries and individuals 

 that would have use for it, Dr. King kindly consented to allow the Geological 

 Survey to print it as a Geological Survey Memoir, and thus secure for it 

 adequate distribution in geological quarters. 



The Geological Survey is pleased to be able to add to its list of Memoirs 

 this work that deals with the geology of such a long and important section 

 through the Western Cordillera. It must be referred to constantly in future 

 work dealing with the geology of British Columbia, and were it not available 

 in the publications of the Survey great loss and inconvenience would result. 



(Signed) R. W. Brock, 



Director. 

 Geological Survey, 



Ottawa, October 21, 1912. 



