458 



THE ILLINOIS GLACIAL LOBE. 



The following measurements were made to ascertain the amount of the abrasion 

 of the west shore of Lake Michigan, in Milwaukee County, since the Government 

 survey, made in 1835 and 1S36: 



South Hue, sec. 1. T.5.R.22... 

 South line, sec. 36, T. 0, R. 22 . 

 South line, see. 24, T. 6. R. 22. 

 South line, sec. 21, T. 7, R. 22. 

 South line, sec. 15, T. 7, R. 22. 

 South line, sec. 10, T. 7, R, 22. 

 South line, sec. 3, T. 7, R. 22 . . . 

 South line, sec. 34, T. 8, R. 22. 



Mean 



The loss in other counties bordering the lake is less on the average. 



A few measurements of the rate of erosion of the lake bluff near New 

 Buffalo, Michigan, have been made by Mr. Grlavin, formerly county sur- 

 veyor. His measurements were made at dates ranging from 1870 to 1886. 

 The land survey was made in 1829. The shortest period of erosion is 

 therefore forty-one years, and the longest fifty-seven years. In one case 

 (south line of sec. 8, T. 7 S., R. 20 W.) there has been a gain where a 

 dune has encroached on the lake. 



Erosion of the lake shore in Berrien County, Michigan. 



Locality. 



12.41 



34.00 



76.90 

 34.00 



On range line between Rs. 20 and 21 W., from quarter post of 



sec. 30 north to lake 



On line of sees. 25 and 36, T. 7 S., R. 21 W., from quarter post 



west to lake 



On south line of sec. 35, T. 7 S., R. 21 W., from east end of line 



west to lake ■ 



From quarter post of sec. 17, T. 7 S., R. 20 W., north to lake — 

 On south line of sec. 17, T. 7 S., R. 20 W., from quarter post 



west to lake I 34.50 



Eastlineofsec.8,T.7S.,R.20W 34.73 



South liue of sec. 8, T. 7 S., R. 20 W j 42.34 



North line of sec. 9, T. 7 S., R. 20 W., from quarter post west to 



lake i 34.00 



Mean 



