THE SHETBNNE DELTA. 315 



Herman beach in the north'we.st quarter of section 10, township 135, 

 range 54, 1,075 to 1,080 feet. This is a deposit of gravel and sand 

 extending ahjng the verge of the phxteaii of till just described in section 9. 

 Fifteen or 20 rods to the east the elevation is 1,0G5 feet, and it sinks slowly 

 thence eastward to about 1,050 feet at the west base of the dunes in sections 

 12 and 1 of this township. 



Lakelet back of this beach, situated in the east edge of the southeast 

 quarter of section 4, township lo5, range 54, about 50 rods long from south 

 to north, 1,060 feet, being 25 feet below the average of the adjacent 

 undulating till. Shallow lakelet 40 rods across, close east of the beach, a 

 cpiarter of a mile east from the northwest corner of section 3, also 1,000 

 feet; adjoining laiid, 1,065 to 1,070 feet, excepting on the west, where the 

 Herman beach has an elevation of 1,080 feet, with undulating till beyond 

 it a few feet higher. 



Herman beach at the middle of the west side of section 34, township 

 136, range 54, Sheldon, 1,082 feet; surface 25 rods east, 1,070 feet, thence 

 descending slowly eastward. Here and for Ij miles south, through section 

 3, this beach is a flattened ridge of sand and fine gravel, 25 or 30 rods wide, 

 with a depression 3 to .6 feet deep along its west side. In the northwest 

 quarter of section 28 its elevation is 1,080 feet. 



Fargo and Southwestern Railroad track at Sheldon, 1,080 feet. Wells 

 in Sheldon village are 10 to 15 feet deep; in sandy clay, free from gravel 

 or bowlders, 6 to 10 feet, with sand below. These deposits belong to the 

 Herman lieach, which is here spread upon a width of about a half mile. 



DELTA OF THE SHEYENNE RIVER. 



(PLATE XXVII.) 



The delta deposited by the Sheyenne River in Lake Agassiz reaches 

 from the Lightnings Nest 50 miles northwest to the south bend of the Maple 

 River, and has a maximum width of nearly 30 miles to the northeast from 

 the south bend of the Sheyenne. It probably covers an area of 800 square 

 miles to an average depth of 40 feet, its volujxie being, therefore, about 6 

 cubic miles. Large tracts of this delta are channeled by the winds and 

 heaped up in dunes, as before noted, which rise to heights of 25 to 100 feet 



