276 W. UPHAM GLACIAL LAKES IN CANADA. 



opinions expressed by Mr. Tyrrell, I believe I am right in stating that that 

 gentleman has not advocated the existence of a driftless area along the base of 

 the Rocky Mountains in Alberta, but rather that such eastern drift as occurs 

 along a belt of country near the base of the mountains is to be explained as 

 the deposit made in a lake or lakes held in there by the margin of a conti- 

 nental glacier.* 



On the question of the meaning of the White silt formations of the British 

 Columbian region, I need not, I think, say anything at the present time, as 

 the general result of my examination of these deposits, with reference to the 

 observations made over all parts of the area in which they are found, have 

 lately been published. Nothing has since occurred to affect the general 

 conclusions at that time provisionally arrived at, and I can scarcely accept 

 Mr. Upham's strictly academic statement of his belief on the subject as 

 weakening the force of such arguments as have grown up around the facts. 



*Bull. Geol. Soc. Am., vol. 1, p. 401. 



