M'CAULEYVILLE SHORES IN NOETH DAKOTA. 



435 



lower here than the jiresent height of the Bois des Sioux Valley at White 

 Rock, which then was the mouth of Lake Agassiz. The uorthward depres- 

 sion of the iuterveiiing area or its southward uplift, iuharmonious with the 

 epeirogenic movements of all other explored parts of the lake basin, was 



Fig. 23. — Profile across beaches at ami uear Wheatland, N. Dak. Hurizoutal scale, 2* miles to au inch. 



about 3 inches per mile along its extent of 40 miles, taking place after the 

 flow of the River Warren ceased. 



Northward from the Sheyenne delta, the McCauleyville shore through 

 the next 30 miles lies within a mile, or mostly a half mile or less, to the 

 east of the Campbell shore, both passing close east of Wheatland and 

 Arthm*. Fig. 23 presents a protile crossing the western beaches of Lake 

 Agassiz on the Northern Pacific Railroad in the vicinity of Wheatland and 

 westwai'd. About 2 miles south of Arthur these two shore-lines, each there 

 marked by a beach ridge, are only au eighth to a quarter of a mile apart. 



ir->7>ii:: 



i'lu. 24 Protile across beaches at Huuter, N. Dak., and westward. Uorizoutal scale, 2A miles to an inch. 



The crest of the lower ridge, which probably belongs to the upper McCau- 

 leyville stage, is 983 to 987 feet above the sea. Eight miles north of this 

 locality, the McCauleyville shore at Hunter is a, low, eroded escarpment of 

 till, which falls from 980 to 96.") feet, passing in a north-northwesterly 



