[camsell] great canon OF FR.\SER RIVER 59 



in a tributary stream is due to valley glaciation, the lower break is 

 due to the difference in the rates of erosion of the main and tributary 

 streams. 



The history of the canon above outlined seems to the writer to 

 be the most likely one that can be worked out from the evidence at 

 present to hand bearing on the subject. It is fair to state, however, 

 that N. L. Bowen, in an unpublished report of the Geological Survey 

 on this region, holds a different opinion on the history of that part of 

 Fraser valley below Hope. Bowen considers that Fraser river in the 

 canon is an adjusted stream, that it at one time occupied the valleys 

 of Silver and Klesilkwa creeks and found an outlet to the sea by way 

 of Skagit valley, and that the westward flowing portion below Hope 

 is the result of capture and diversion which reversed the flow of Silver 

 creek. This conception, however, does not conflict with the ideas 

 presented by the present writer regarding the history of the canon 

 of Fraser river. 



