418 THE GLACIAL LAKE AGASSIZ. 



chains of pools iu summer), the Campbell shore is almost contimiously an 

 escarpment of till, as shown by fig. 7 on page 26, with its crest and the 

 level of the surface westward at 995 to 1,005 feet, from which a somewhat 

 steep slope falls 10 to 20 feet eastward. It passes about three-fourths of 

 a mile west of Hunter and 2 miles west of Greenfield. Along all this 

 distance the nearly parallel McCauleyville shore, 20 to 30 feet below the 

 top of the Campbell escarpment, lies about a mile, or in part only a half 

 mile, farther east. 



From a mile east of Roseville the Campbell shore runs nearly due north 

 4 miles to the west edge of the town of Portland, where it is an escarpment 

 12 to 15 feet high, with its crest and base respectively about 1,000 feet 

 and 985 feet above the sea. The escarpment is eroded in the southern 

 extremity of the sand and silt delta which reaches from McCanna to Port- 

 land, deposited by a river flowing into Lake Agassiz from the Elk Valley 

 while lobes of the melting and retreating ice-sheet lay on each side. For 

 its next 8 miles this shore-line passes northeastward to Morgan Township, 

 in which it curves to the north and north-northwest; and thence it holds 

 the latter com-se, with only deviations of a few degrees, through a distance 

 of 75 miles north to the Pembina delta. Between Portland and Ai-villa it 

 is mostly marked by a well-defined beach ridge of gravel and sand, lying 

 on till, at a distance of 2 to 3 miles east from the margin of the delta, which 

 coincides nearly with the Tintah shore-lines. 



The Great Northern Railway crosses this ridge three-fourths of a mile 

 east of Arvilla, where it occupies a width of about 60 rods. Its crest has 

 an elevation of 1,014 feet, from which there is a descent of 23 feet to the 

 east and 9 feet to the west. Close south of the Turtle River, nearly 2 miles 

 farther north, its top is at 1,011 to 1,013 feet; and within the next mile 

 north of this stream its elevation is 1,007 to 1,010 feet. In the vicinity of 

 Ai-villa and through nearly 15 miles onward, passing through townships 152, 

 Hegton, and 153, range 54, both the Campbell and McCauleyville shores 

 bear conspicuous beach ridges, which are nearly parallel at a distance of 

 about a half mile apart. 



In section 5, township 153, range 54, and for 6 miles thence northward 

 in Strabane and Inkster, passing a third of a mile east of lukster station. 



