326 THE GLACIAL LAKE AGASSIZ. 



FROM GALESBURG NORTH TO LARIMORE. 



(PLATES XXVIII AND XXIX.) 



Ill section 20, Galesburg, the beach is about a third of a mile wide, 

 its higher western margin lieing at 1,097 to 1,102 feet. From its crest a 

 slope descends first somewhat steeply and then slowly to the amount of 20 

 or 25 feet in two-thirds of a mile eastward, having a subsoil of sand and 

 very tine gravel to a depth of 5 to 10 feet, underlain by till, as is shown by 

 wells at Galesburg. Crest of this beach through the west half of section 

 17, 1,102 to 1,107 feet; in section 6, Galesbiu-g, and in sections 32 and 29, 

 Norman, 1,115 to 1,125 feet, being 10 to 15 feet higher than on the south 

 and north; in sections 20 and 17, al)out 1,110 feet; in the southwest part 

 of section 8, 1,117 feet; westward through section 7 of this township, and 

 through the northeast part of section 12, township 145, range 54, 1,112 to 

 1,117 feet. On the line between Traill and Steele counties, where the top 

 of the ridge is at 1,114 feet, it is a typical beach deposit about 25 rods 

 wide, composed of sand and gravel, with pebliles up to 2 or 3 inches in 

 diameter. Its course is due west, and the descent from crest to base on the 

 south is 6 or 8 feet, and northward 12 or 15 feet, beyond which a very 

 gentle slope sinks toward the northeast. A well on this beach, in the east 

 edge of the nf>rthwest quarter of section 12, township 145, range 54, went 

 through sand and fine gravel 13 feet, tinding till below. Witliin a few 

 hundred feet farther west the beach is interrupted for a distance of about 1 

 mile by an area of till some 15 feet lower, with no beach deposits. It 

 reappears, however, as a typical beach ridge of gravel and sand for a dis- 

 tance of three-fourths of a mile in the northwest quarter of section 11 and 

 the northeast quarter of section 10, having an elevation of 1,114 to 1,112 

 feet, with a slough on its south side 6 to 8 feet lower. 



Returning to the vicinit}' of Galesburg, a slightly higher l^each, approx- 

 imately parallel with the foregcjing, remains to be traced. It becomes 

 recognizable in the west edge of section 20, Galesburg, where the border 

 of the area of rolling till that extends thence westward bears occasional 

 deposits of gravel at 1,115 to 1,120 feet. In the east part of section 18 it 

 is a well-developed beach ridge of sand and fine gravel 30 to 50 rods wide, 



