DRAINAGE SYSTEMS AND THE GLACIAL PERIOD. 197 



To this period must probably be referred also the 

 formation of the gorge, or more properly fiord, of the 



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Saguenay, which joins the St. Lawrence below Quebec. 

 The great depth of this fiord is certainly surprising, since, 

 according to Sir William Dawson, its bottom, for fifty 

 miles above the St. Lawrence, is 840 feet below the sea- 

 level, while the bordering cliffs are in some places 1,500 

 feet above the water. The average width is something 

 over a mile. 



