THE TINTAII BEACHES IN MINNESOTA. 399 



foi'iiis a massive gravel and sand ridge, with crest at 1,015 to 1,017 feet, 

 rising 10 feet above the adjoining area of till on each side; and it continues 

 north with the same conspicuous development through the east edge of 

 section 31 and the southeast quarter of section 30, Akron. 



Across the next 3 miles both these beaches fail, and the surface in their 

 course is nearly flat till, with a thin covering of lacustrine silt, which is 

 apj)arently due to the action of the lake during the deposition of the 

 englacial till from the melting and receding ice-sheet. 



Again, the upper Tintah beach has a very massive and higher devel- 

 opment in the southwest corner of section 8, Akron, and extends with a 

 width of 30 to 40 rods and an elevation of 1,024 to 1,029 feet above the 

 sea along the east side of sections 7 and 6, the top of its ridge coincid- 

 ing- nearly with the south-to-north section line. Its maximum width and 

 height are attained at tlie quarter-section stake between sections 7 and 8. 

 On the east the descent from its crest is 3 to 6 feet, and on the west 10 to 

 15 feet within 20 rods. This gravel and sand beach ])asses onward, less 

 massive, but having a distinctly ridged form, through the western tier of 

 sections in Tanberg. In the east edge of sections 31 and 30 its elevation 

 is approximately 1,028 feet. In section 19 it is oifset a quarter of a mile 

 to the west, and thence runs nearly due north 3 miles, being lost near the 

 center of section 6 in a marshy tract. 



The lower Tintah beach also forms a conspicuous gravel ridge, nearly 

 parallel with the foregoing, at a distance of 1 mile to a half mile west, 

 beginning in the northeast quarter of section 12, township 134, range 46, 

 and running slightly west of north, with an elevation of 1,015 to 1,017 feet, 

 about 3 miles to the east part of section 25, Manston. There it is offset a 

 quarter of a mile to the east, and thence runs due north along the west line 

 of Tanberg, having a height of l,01(i to 1,018 feet, to the marshes in which, 

 like the upper Tintah beach, it is lost near the northwest corner of this 

 township. 



Both the Tintah beaches were next identified in the vicinity of Barnes- 

 ville. On the northern border of a Ijowlder-strewn higher tract of till the 

 upper Tintah shore-line is marked in the south part of section 3(J, Barues- 

 ville, at a distance of about a quarter of a mile east of the railway line to 



