430 THE GLACIAL LAKE AGASSIZ. 



One to 4 miles farther north, in sections 34, 27, 22, 21, and 16, Elkton, 

 two McCauleyville beach ridges are chstinctly developed, extending- north- 

 northwesterly close alongside of the railway that runs from Barnesville to 

 Glyndon. The upper beach has an elevation at its crest of 970 to 976 

 feet above the sea. It lies about an eighth of a mile east of the railway 

 and was seen to be continuous at least 3 miles, attaining its most massive 

 development and maximum height near Downer station, where its gravel, 

 8 to 10 feet in de])th, has been largely excavated for railway ballast. The 

 lower beach is smaller, and in part consists of a belt of sand and gravel, 

 lying on the westwardly descending slope of till, without forming a definite 

 ridge, while other parts are ridged up 1 to 2 feet above the east margin of 

 the belt. Its gravel contains pebbles and cobbles up to 3 inches in diameter, 

 and the depth of this deposit ranges from 3 to 5 feet. The elevation of its 

 top is 964 to 966 feet, and its western base at 960 feet marks approximately 

 the lake level when this second beach was formed, probably 8 or 10 feet 

 lower than at the time of the higher beach. 



About a mile north of Downer these shore-lines turn to a nearly due- 

 north course, leaving this line of the Great Northern Railway. On the 

 Northern Pacific Railroad they are united in a beach ridge that is crossed 

 5 miles east of Glyndon, having a width of about 20 rods, with descent of 

 3 feet to the east and 10 feet to the west from its crest, which is 983 feet 

 above the sea. Thence tlu-ough a distance of about 20 miles to the north 

 the McCauleyville shore is not exactly traced, but is known to he close 

 west of the higher shore-lines, because the border of the lacustrine area 

 rises steeply eastward. 



In Rockwell and Lake Ida townships a well-marked McCauleyville 

 beach ridge of gravel and sand, with till on each side, was traced several 

 miles, lying about a half mile west of the Campbell escarpment and beach. 

 Where it is crossed by the road on the north line of the northwest quarter 

 of section 26, Lake Ida, its width is about 30 rods, and its east and west 

 slopes fall respectively about 5 and 15 feet, its crest being 10 to 15 feet 

 lower than that of the similarly massive Campbell ridge, which is a half 

 mile distant to the east. The elevations of these ridges were not ascertained 

 by leveling, but are probably about 985 and 1,000 feet above the sea. 



