406 THE GLACIAL LAKE AGASSIZ. 



generally the case in this region, project 2 to 3 or 4 feet above the surface, 

 or lie wholly on it with no portion concealed. Here the ice-sheet probably 

 terminated, depositing these bowlders in the west margin of Lake Agassiz, 

 during the time of its accumulation of the terminal moraine that forms the 

 west part of the Tiger Hills and the Brandon and Arrow hills. 



About a mile south and west of Nelson, the lower Tintah beach ridge, 

 having- an elevation of 1,085 feet, approximately, lies an eighth of a mile 

 west from the margin of the terrace ; and the upper Tintah beach probably 

 extends along its west side, close to the base of the Pembina Mountain, 

 where the elevation is about 1,100 to 1,120 feet. The width of the terrace 

 here is about 1^ miles. 



A half mile east of the lower Norcross beach, near Treherne, the 

 upper Tintah shore seems to be indicated where it crosses the railway by 

 a line of erosion in the Assiniboine delta, with descent approximately from 

 1,140 to 1,120 feet. 



On the profile of the Manitoba and Northwestern Railway the upper 

 and lower Tintah beaches are apparently shown about 3 miles and 5J miles 

 east-northeast of Neepawa, with their crests respectively at l,ir)8 feet and 

 in two ridges at 1,116 and 1,111 feet above the sea. Within its next 3 

 miles northward the upper beach is represented by a tract of low dunes 

 extending through the east edge of townsliip 15, range 15, to Snake Creek. 

 Thence the course of these shore-lines, as shown by the contour, is nearly 

 due north to the foot of the escarpment of Riding Mountain, in township 17. 



Along the eastern base of Duck Mountain the Tintah shores of Lake 

 Agassiz have been observed by Mr. Tyrrell, according to my correlation of 

 the beaches shown on his map (see p. 395), as follows: The npper Tintah 

 beach, close north of the Valley River, at an elevation of 1,220 feet above 

 tlie sea; both the upper and lower Tintah beaches on Shanty Creek, respec- 

 tively, at 1,287 feet and 1,235 feet; and the upper of these beaches, extending 

 several miles between the Pine ami Duck rivo's, at 1,3G5 feet. In propor- 

 tion with the northward ascent of the upper Tintah beach thus indicated, 

 its height on the Pine River would be about 1,335 feet, and on the Duck 

 River, a dozen miles farther north, at latitude 52°, about 1,375 feet. 



