l6o /. BURR TYRRELL 



while another probably rested over the country north of Baker 

 Lake and Chesterfield Inlet. Even at the present day it would 

 take but a slight reduction in temperature, or a slightly greater 

 precipitation, to cause that northern country to be covered with 

 snow, for in the middle of August heavy patches of snow were 

 seen resting on many of the hillsides and Doobaunt Lake was 

 almost completely covered with a thick sheet of ice. 



After the glaciers had been greatly reduced, or had entirely 

 disappeared, the land west of Hudson Bay stood about 500 or 

 600 feet below its present level, and subsequently it gradually 

 rose until it reached its present condition of comparative stability. 



Whether the three great glaciers here referred to, namely, 

 the Cordilleran, the Keewatin and the Labradorean, originated 

 at the same time or not I do not know, and whether they waited 

 for one another's disappearance or not I do not know ; but this 

 much appears certain that the Cordilleran glacier had reached 

 its greatest extent and had retired, before the Keewatin glacier 

 reached its extreme western limit ; and that the Keewatin glacier, 

 after covering the Plains region of central Canada for a great 

 length of time, had retired a long distance toward its central 

 gathering ground, before the Labradorean glacier reached its 

 utmost western limit, and that ^it had shrunk to a very meager 

 representative of its former greatness, when the latter glacier 

 was still of magnificent propositions. 



J. Burr Tyrrell. 



