440 THE GLACIAL LAKE AGASSIZ. 



section 26, and the west lialf of section 35 of this township, two McCau- 

 leyville beaches are developed as small jDarallel ridges of gravel and sand. 

 The upper one has an elevation of 1,000 to 1,002 feet at its crest, from 

 which there is a descent of 1 to 2 feet within 2 or 3 rods to the west and 5 

 to 8 feet in 10 or 12 rods to the east. Thence a nearly level surface of till 

 with frequent bowlders occupies a width of 10 or 12 rods, and is succeeded 

 on the east by the second ridge, the western slope of which rises 2 or 3 feet 

 to its crest. This is about 5 feet lower than the upper beach, and has a 

 similar descent of 5 feet or more on its east side. 



Fig. 29 presents a section crossing the McCauleyville and higher 

 beaches on the latitude of Mountain City, where the Pembina Mountain 

 ascends less steeply than throughout the greater part of its extent. 



Fig. 29. — Section across ranges 6 and 5, Manitoba, U to 10 miles uortli of the international boundary. Horizontal scale, 

 2^ miles to an inch. 



About a quarter of a mile east of Nelson the upper McCauleyville 

 shore is a line of ei-osion with a descent of 5 to 10 feet within a short 

 distance from west to east. Four miles thence to the north-northwest it is 

 a well-defined Ijeach ridge running close to the bridge over Boyds Creek, 

 near the northeast corner of section 21, township 4, range 0; and it con- 

 tinues, but is less conspicuous, through the next 3 miles northward to the 

 church in the northeast corner of section 5, township 5, range 6, a quarter 

 of a mile east of Miami post-office. Its crest at Boyds Creek is 8 to 

 10 feet, and at Miami 5 feet, above the more massive second or middle 

 McCauleyville beach, which lies a quarter to a half of a mile farther east, 

 passing north-northwesterly tlirough the west edge of section 27, and the 

 east half of section 33, township 4, in which latter it is offset nearly a 



