THE MILNOK BEACHES. 311 



another beacli ridge fornu'd during the same stage of Lake Agassiz, a third 

 of a mile farther west, crest and grade, 1,086 feet; hind close east, 1,081, 

 and west 1,087 feet; track at Milnor, 1,097 feet. 



The Herman beach west and north of Wyndmere has an irregular sitr- 

 face, with frequent hummocks of sand heaped 5 to 10 feet above adjacent 

 hollows. Most of these dunes are now grassed. From near Wyndmere 

 this beach, with frc(|ueut small dunes, extends north through the west edge 

 of township 133, range 51, and thence westerly to another tract of promi- 

 nent dunes 60 to 100 feet above the adjacent surface, with their top at 1,100 

 to 1,150 feet, Avhich extends about 10 miles in a west-northwest course 

 from the southwest part of township 134, range 52, to the east part of town- 

 ship 134, range 54, terminating about 2 miles east of the Sheyenne River. 

 Like the similar high dunes south of the AVild Rice River, these are mainly 

 covered by herbage, bushes, and small trees; but many portions are now 

 being drifted by the winds, so that they are wholly destitute of vegetation. 

 These dunes mark the course of the Herman beach, here greatly increased 

 in volume by delta dejjosits from the Sheyenne River. 



Morainic knolls and hills, rising 20 to 50 feet, with plentiful bowlders, 

 lie close west of Milnor, extending in a belt from southeast to northwest. 

 They fii'G referred to the seventh or Dovre moraine, as described in Chapter 

 IV. Near Lisbon, about 15 miles northwest from Milnor, some of these 

 morainic hills are quite conspicuous, rising 100 feet or more above the sur- 

 rounding country. 



Evidence of a stage of Lake Agassiz 20 or 30 feet higher than that of 

 the Herman beach is found, as before noticed, in many places along the 

 southern part of its Ijoundary in North Dakota. The portion of this glacial 

 lake formed earliest by the recession of the ice seems to have reached from 

 Lake Traverse to the Sheyenne River, and its level appears to have been 

 then nearl)^ that of the general surface and the top of the blufiPs bordering 

 Lake Traverse. An explanation of the conditions probably producing this 

 Milnor stage of the incipient glacial lake, with the reasons why it was 

 limited to a comparatively short extent on the southwestern border of the 

 lake area, has been presented on pages 150 and 211. 



