NOECROSS BEACHES IN MANITOBA, 395 



bed of the railway here, formed of the sand of the Assiuiboine delta, 

 further worn and redeposited by the lake waves, proves somewhat insecure 

 because of its liability to be channeled by the wind. The road leading- 

 northward from Neepawa to Eden and Riding Mountain runs on the crest 

 of the upper Norcross beach ridge through the east part of sections 21 and 

 28, township 15, range 15, 3 to 5 miles north of tlie.railway, its crest there 

 having a nearly constant height of 1,223 feet, with a descent of 5 or 6 feet 

 from it to the east and half as much to the west. Thence this beach ridge 

 continues north-northeasterly to the east part of section 23, township 16, 

 range 15, where it has an elevation of 1,225 to 1,230 feet, with width of 

 about 30 rods and descent of 10 to 15 feet on its east side. It next runs 

 north or slightly west of north to Thunder Creek, in tlie south part of town- 

 ship 17, beyond which its course, with that of the lower Norcross shore, is 

 along the steep ascent of Riding Mountain. In the journey from Eden 

 post-office (southwest quarter of section 22, township 16, range 15) to 

 Orange Ridge post-office (northwest quarter of section 32, township 16, 

 range 14) a nearly flat surface of till with frequent bowlders is crossed 

 upon the width of 3 miles between this beach and the upper Campbell 

 beach, descending in that distance from 1,200 to 1,100 feet, approximately. 

 Bowlders are especially abundant within the first mile from the upper Nor- 

 cross beach, whence the erosion of the lake bed svipplied its gravel and 

 sand. This even tract of till would seem most favorable for the accumula- 

 tion of the beaches belonging to stages of Lake Agassiz between its upper 

 Norcross and upper Campbell levels; but no beach ridge nor other deposit 

 of gravel and sand, nor line of erosion which sometimes takes the place of 

 these to mark a shore-line, was seen in the intervening distance. It seems 

 probable that not far south and north from this route of observation the 

 lower Norcross and the two Tintah beaches will be found. 



My study of the beaches of Lake Agassiz mapped by Mr. J. B. TyrrelP 

 on the eastern flanks of Riding and Duck mountains leads me to correlate 

 the two highest gravel ridges near the Valley River, having elevations of 

 1,280 and 1,260 feet above the sea, with the upper and lower Norcross 

 beaches traced by me in North Dakota and southwestern Manitoba. The 



' Geol. and Nat. Hist. Survey of Canada, Annual Report, new series, Vol. Ill, for 1887-88, Part E. 



