480 THE GLACIAL LAKE AGASSIZ. 



of the elevation of the beaches noted by Mr. Tyrrell with those determined 

 by my survey, I am enabled to correlate very satisfactorily the two sets of 

 shore-lines. The northern continuations of the successive lake levels from 

 the upper Norcross stage to the Niverville stag-es, inclusive, are thus identi- 

 fied upon a region lying 50 to 200 miles beyond the area examined by me. 

 This correlation has been tabularly presented on page 477, in juxtaposition 

 with the table showing how the shore-liues ascend along their extent from 

 Lake Traverse to Gladstone. 



In the southern area of my exploration nearly equal distances divide 

 the several sections across the shore-lines which are compared together; 

 but upon the country described by Mr. Tyrrell the spaces dividing succes- 

 sive sections are of various lengths. Between the latitude of Gladstone and 

 the Valley River is a distance of 67 miles. Thence to Shanty Creek, the 

 next locality f)f numerous observations, tliere is an interval of only 20 

 miles. Notations of the heights of nine beaches near the Pine, Duck, and 

 Swan rivers are upon an area 25 to 45 miles farther north. In this group 

 the observations in the valley of the Swan River are 20 to 30 miles west 

 of the others, and therefore have, on account of the north-northeastward 

 direction of the ascent of the former lake levels, a nearer equivalence with 

 the elevations of beaches on the Pine River than on the Duck River. The 

 fourth series of beaches recorded is on Kettle Hill, close south of Swan 

 Lake, at a distance of some 20 or 25 miles north from the Duck River 

 and the northern end of Duck Mountain, and about 150 miles north from 

 the latitude of Gladstone. Finally, the fifth series was noted on Mossy 

 portage and at the Grand Rapids of the Saskatchewan, about 50 miles north 

 of the last. 



As already stated in Chapters V and VIII, the beaches east and north 

 of Riding and Duck mountains are found to have a more rapid northward 

 ascent than along their southern portion traced by my leveling. It is also 

 very noteworthy that this large amount of differential uplifting was chiefly 

 done after the time of formation of the Camyjbell beaches, whereas nearly 

 all the uplifting of the area from the southern mouth of Lake Agassiz to 

 Gladstone had taken place earlier. During the first third or half of the 

 period of the entire duration of Lake Agassiz the southern and central part 



