436 THE GLACIAL LAKE AGASSIZ. 



course a quarter of a mile east of the railway station and about 1 mile east 

 of the similarly eroded Campbell shore. Fig. 24 shows the westward 

 ascent of the border of the lacustrine area in the vicinity of Hunter. 

 Thence these shore-lines extend 15 miles north-northwest and 6 miles north 

 to Mayville and Portland, holding a distance of about 1 mile to 1^ miles 

 apart. 



The upper McCauleyville shore, approximately 080 feet above the sea, 

 passes about a mile west and northwest of Mayville, but is not definitely 

 marked on the almost level surface of lacustrine silt. For 12 or 15 miles 

 in this part of its course, from 6 miles south to an equal distance northeast 

 of Mayville, the lower McCauleyville shore, on account of the very slow 

 .descent of the land, lies probably 2 or 3 miles farther east, but it too is 

 only dimly traceable. 





9ee 



Fig. 25. — Profile across beaches in the vicinity of Arvilla ami Larimoro. N. Dak. Hurizuutal st-ale, 2k miles to an inch. 



Continuing northward to the vicinity of Arvilla, the ujjper and lower 

 shore-lines converge, and on the Great Northern Railway, as shown on fig. 

 25, they together form a massive beach ridge, about 50 rods wide, with its 

 crest 991 feet above the sea, from which its slopes descend 18 feet to the 

 east and 8 feet to the west. This ridge lies a mile east of Arvilla, being 

 about a third of a mile east of the still more conspicuous Campbell beach. 



Beyond Ai-villa the upper and principal McCauleyville shore is almost 

 continuously marked by a fine beach ridge of gravel and sand, 5 to 10 feet 

 above the adjoining surface of till on the west and east, tlu'ough an extent 

 of more than 30 miles to Park River. In section 14, Hegton, 4 to 5 miles 

 north of Arvilla, the crest of this ridge is 995 feet above the sea, and other 

 determinations of its height in sections 27 and 16 of the next township on 



