GEOLOGY 231 



tude 81 30', having marked mineralogical characters by which 

 the identity of some garnets from Tiskernaces was established. 

 Drawing a conclusion from such observations, it became evident 

 that the main line of the drift, indicating the direction of its 

 motion, runs from south to north." 



Dr. Bell in his report on the geology of Hudson bay and 

 Hudson strait, 1885, draws attention to the flow of the ice from 

 the land on both sides of the strait into that body of water, 

 while the striae on the islands in the strait show that a great 

 stream of ice passed eastward through the strait from Hudson 

 bay into the north Atlantic. These observations have since 

 been confirmed by observations of the strise on other islands of 

 the strait. 



Tyrrell's observations on the glacial phenomena of the bar- 

 ren-land region west of Hudson bay show that the country was 

 intensely glaciated ; that the centre of glaciation was on a nearly 

 level plain now elevated some 400 or 500 feet above sea-level, 

 there being no evidence to show that it was much more elevated 

 during the period of glaciation. The centre of ice distribution 

 was situated close to the western shores of Hudson bay, and the 

 moisture sufficient to allow of such an accumulation of ice was 

 probably derived from an open Arctic sea. The glacier moved 

 south and southwest from this centre up a gradual grade to 

 Manitoba, where morainic accumulations are found on the sum- 

 mits of the Duck mountains at elevations from 1,800 to 2,400 

 feet above present sea-level. Striae evidently formed by moving 

 ice from this centre have been found by Dr. Barlow and the 

 writer on the branches of the Moose river to the south of James 

 bay, where the movement was from the northwest. 



There is little doubt that the ice also moved northward from 

 the centre of glaciation, and that the evidence quoted above of 

 the erratics found in the western Arctic islands is proof of 

 this. 



