THE SLIMS GLACIER 207 



or confluent glacier mass of the west coast, was 

 included between the fifty-fifth and the fifty- 

 ninth parallels of latitude, and that its well- 

 defined movement was from the south to the 

 north. Therefore at one time all of this wide 

 stretch of country was covered with a moving 

 mass of ice, crushing and breaking down 

 everything within its path. "While the 

 greater part of the area traversed is more or 

 less completely mantled with glacial deposits, 

 it will be observed that true boulder-clay was 

 found in certain parts only of the southern 

 and more mountainous portion of the region, 

 while it spreads over almost the entire length 

 of the upper Pelly and Lewis (Yukon) val- 

 leys, though not found exposed quite to their 

 confluence." 



Dr. Dawson attributes the presence of both 

 the fine and the coarse gold which is found in 

 the Yukon basin entirely to the grinding ef- 

 fects of this wide-spread glacial action. 



