246 THE ICE AGE IN NORTH AMERICA. 



coast much farther southward, and adds, "Drawing a con- 

 clusion from such observations, it becomes evident that the 

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

 runs from south to north."* 



It may further be mentioned that Dr. R. Bell, of the Cana- 

 dian Geological Survey, has found evidence of a northward or 

 northeastward movement of glacier-ice in the northern part of 

 Hudson Bay, with distinct indications of eastward glaciation 

 in Hudson Strait. \ For the northern part of the great Mac- 

 kenzie Valley we are as yet without any very definite infor- 

 mation, but Sir J. Richardson notes that Lauren fcian bowlders 

 are scattered westward over the nearly horizontal limestones of 

 the district. 



Taken in conjunction with the facts for the more southern 

 portion of the continent, already pretty well known, the ob- 

 servations here outlined would appear to indicate a general 

 movement of ice outward, in all directions, from the great 

 Laurentian axis or plateau which' extends from Labrador round 

 the southern extremity of Hudson Bay to the Arctic Sea ; 

 while a second, smaller, though still very important region of 

 dispersion — the Cordilleran glacier-mass — occupied the Rocky 

 Mountain region on the west, with the northern and southern 

 limits before approximately stated. J 



Some facts already mentioned # have prepared the way for 

 the discussion of that most puzzling and interesting problem 

 of the upward transportation of earthy material in moving 

 ice. The evidence upon this point is too abundant to be 

 ignored. Professor Charles H. Hitchcock reports rinding near 

 the very summit of Mount Washington many small bowlders 

 which must have been elevated a considerable portion of its en- 

 tire height. One of these bowlders, weighing ninety pounds, 

 is now deposited in the museum of Dartmouth College ; and 



* " Nature," vol. ix. 



f "Annual Report of the Geological Survey," Canada, 1885, p. 14, D. D; 

 and "Report of Progress," 1882-'84, p. 36, D. D. 



\ See "Glaciation of British Columbia," "Geological Magazine," August, 

 1888, pp. 348, 349. 



* See above, pp. 197, 240 



