REVISION OF THE MAP OF LAKE AGASSIZ 783 



like the Herman stage, and like the lower Tintah, Campbell, and 

 McCauleyville stages, becomes subdivided in its extension north- 

 ward before reaching the International Boundary at the west side 

 of Lake Agassiz. In my examination and studies of these shore- 

 lines for the geological surveys of the United States and Canada, 

 the whole series of seven Herman beaches was regarded as yet 

 present so far north as on the boundary between North Dakota 

 and Manitoba, 224 miles north of Lake Traverse; but the two 

 upper Herman beaches were thought to cease before coming to 

 the latitude of Gladstone and Neepawa, in Manitoba, 308 miles 

 from Lake Traverse and the mouth of the glacial lake. On Valley 

 River in Manitoba, between the Riding and Duck mountains, 150 

 miles north of the international boundary and 375 miles from Lake 

 Traverse, all the Herman beaches had ceased, according to my 

 tabulation and correlation of the notes of Mr. J. B. Tyrrell, of the 

 Canadian Geological Survey; but the Norcross, Tintah, Campbell, 

 and McCauleyville beaches seem to be represented there by his 

 observations.^ 



The discrepancy between my estimates and those of Mr. 

 Leverett for the place or height of the Herman beaches north of 

 Red Lake comes partly from his better determination of the large 

 easterly component in the direction of maximum uplift and present 

 ascent of the ancient lake-levels, which in their continuation east- 

 ward of Maple Lake trends increasingly toward the northeast. 

 In manuscript notes on a map kindly supplied to me, Mr. Leverett 

 records a well-defined beach of Lake Agassiz, 1,297-1,300 ft. above 

 the sea, on the Minnesota & International Railway about 4 miles 

 northeast of Gemmell, or 25 miles east-southeast from the north 

 part of Red Lake. This is the highest of the Herman series there, 

 and its rate of ascent from the vicinity of Maple Lake justifies the 

 belief that has been already stated concerning the occurrence of 

 the Herman shorelines on the area of Beltrami Island. 



It is to be noted further in this connection that the trend of the 

 Late Glacial uplift of the land and consequent ascent of the old 

 beaches, near Red Lake and the Rainy River, now found to be 

 N. 35° E., carry the conspicuous Campbell beaches farther east 



^ U.S. Geol. Survey Mon. XXV, pp. 476-77- 



