148 THE GLACIAL LAKE AGASSIZ. 



drift hills rise to heights 50 to 150 feet above this lake, or 1,100 to 1,200 

 feet above the sea. Thence a bowlder-strewn, rolling-, and knollv surface, 

 with numerous small lakes, extends west along the south side of the Great 

 Northern Railway to prominent morainic hills, 50 to 100 feet in height, 

 which extend about 7 miles from east to west close south of Greneseo and 

 Cayuga. In the east ^^art of township 130, range 54, this moraine cm-ves 

 to the north, passing about a mile west of Cayviga and Ransom, and north- 

 northeastward tln-ough the northwest part of township 131, range 53. 

 From near the northwest corner of this township it runs to the northwest 

 diagonally across township 132, range 54, passing close west of Milnor, 

 where its knolls and hills are 20 to 50 feet high, with abundant bowlders. 

 The same noi'thwestward course is continued through Ransom County, 

 passing by Lisbon as a belt of knolls and hillocks crowning the southwest 

 bluff of the Sheyenne Valley, to the conspicuous morainic hills (including 

 "Bears Den Hillock") in the vicinity of Fort Ransom, rising 50 to 100 feet 

 above the general level and 250 to 300 feet above the river. 



At the time of accumulation of these hills the ice-sheet had I'etreated 

 a few miles north from the Head of the Coteau des Prairies and 10 to 25 

 miles eastward from the moraine referred to the Kiester, Elysian, and 

 Waconia stages, near Straubville and Nicholson and along Bear Creek. 

 The northeastwardly sloping surface of the greater part of Sargent 

 County was covered by a glacial lake, whose silt beds, confluent south- 

 westward with those of Lake Dakota, are about 1,300 feet above the sea 

 from Sargent and Straubville southward into South Dakota, to Newark, 

 Kidder, and Burch, but decline eastward to about 1,250 feet on the south 

 side of Silver and Sprague lakes. The surface of this glacial lake was 

 1,300 feet, or probably at first 1,310 feet, above the present sea-level, itg 

 outflow being southwestward across the bed of Lake Dakota to the James 

 River. The channel of this outlet is doubtless distinctly traceable. On 

 the north this lake received a large inflowing stream, the representative of 

 the present Sheyenne River, which brought the waters that M-ere discharged 

 from the border of the receding ice-sheet and from the drainage of a con- 

 siderable belt of the adjoining land along all the distance northward to the 

 vicinity of Devils Lake and thence northwestward to the head of the Shey- 



