THE UrrEK OR HEEMAN BEACHIOS. 293 



a tliiril of a mile wide, lies at the east side of this beach, declining in eleva- 

 tion from 1,11 S feet near Mr. Perkins's house to 1,100 feet at Muskoda. 

 This distance is about 3 miles. 



The surface of Lake Agassiz in its inaximum stage was, at Muskoda, 

 1,105 feet, very approximately, above our present sea-level. Within 5 to 

 10 miles northward its height seems to have been 1,110 to 1,1 If) feet. 



Beach through the north half of section 30, Cromwell, 1,128 to 1,131 

 feet, and through the west part of sections 19 and 18, same township, 1,125 

 to 1,130 feet, composed of sand and fine gravel, not generally in a typical 

 ridge, but often with a depression 2 to 5 feet lower eastward and bounded 

 on the west by a descent of about 30 feet within an eighth of a mile. A 

 surface of slightly undulating till rises very gradually from this beach 

 eastward. 



Herman beach at a high portion in or near the southeast quarter of 

 section 1, township 140, range 46, 1,136 feet. For a mile next sovith from 

 this point it is a finely rounded ridge of gravel, rising northward from 1,130 

 to 1,136 feet. The depression at its east side is 4 to 6 feet lower; then the 

 surface gently rises at a quarter to a third of a mile from the beach to 1,135 

 or 1,140 feet, bej^ond which eastward this nearly level but slightly undu- 

 lating expanse of till rises only 5 or 10 feet per mile. Beach a fourth of 

 a mile north-northeast from the high point mentioned, probabl}' in the 

 northwest quarter of section 6, CromAvell, 1,128 to 1,127 feet. This is an 

 ordinary beach ridge of gravel and sand, with a depression of 2 or 3 feet 

 next east. 



Near the south line of section 29, Keene, both the Herman and Nor- 

 cross beaches, here about two-thirds of a mile apart, are intersected by a 

 watercourse. At its north side the upper or Herman beach, near the east 

 line of section 29 and in the northwest quarter of section 28, consists of 

 two well-marked ridges of gravel and sand, soiue 30 rods apart and about 

 10 feet above the land eastward and between them. These ridges unite in 

 or near the southwest quarter of the southwest quarter of section 21, at the 

 height of 1,130 to 1,132 feet. Beach three- fourths of a mile farther north, 

 px-obably near the north line of section 21, a typical gravel ridge, 1,134 feet, 

 10 feet above the land next east; but a sixth of a mile farther northeast this 

 beach ridge is depressed to 1,123 feet. 



