8l2 /. BURR TYRRELL 



center of glaciation the striae were found to be very indefinite, 

 and to have changed in direction as the center slightly shifted 

 its position, but no evidence of any other general glaciation 

 could be found, or that the ice had left the country uncovered 

 from the beginning to the close of the Glacial Epoch. 



In the Geograpliical Journal for November 1895, P- 439> ^ 

 have used the name Keewatin glacier for this continental ice- 

 sheet, as its center lay in the northern portions of the District of 

 Keewatin, and I shall continue to use that name, with the under- 

 standing that if it prove to be the same as the ice-sheet of the 

 Kansan or lowan period it will give place to one of these prior 

 names unless indeed both of the latter should be found to repre- 

 sent re-advances of the same glacier, in which case the name" Kee- 

 watin" might conveniently be retained. At the same time I 

 would suggest that Dr. Dawson's name " Laurentide Glacier" 

 be restricted to that great iner de glace centering over the coun- 

 try north of the St. Lawrence River and the heights of Labrador. 



A portion of the former glacier, advancing southward or 

 southwestward, came in contact with the high escarpment of 

 Cretaceous shales in western Manitoba, and by it was diverted 

 more to the eastward, taking the trend of the great valley of 

 Lake Winnipeg and the Red River. In this direction it appears 

 to have advanced far into Minnesota, Dakota, and Iowa. The 

 Paleeozoic limestones of western Manitoba are beautifully scored 

 by its markings, and its grooves and striae were detected in 

 many places as far east as the east side of Lake Winnipeg. 

 East of Lake Winnipeg the exposed surfaces of the Archaean 

 rocks were carefully searched for this set of markings, but none 

 could be detected. It therefore seems probable that the eastern 

 edge of this lobe or portion of the Keewatin glacier did not 

 extend very far east of the present eastern shore of Lake Win- 

 nipeg, and it is also probable that throughout its advance there 

 was a free drainage eastward, probably into Hudson Bay. 



Traces of the existence of the streams that flowed eastward 

 from the face or side of this glacier were found in several places 

 in the form of deep pot-holes excavated in the summits or on 



