32 CHICAGO ACADEMY OF SCIENCES. 



S. J. Lewis, a well driller, of Elgin, 111., reports a well about 

 one mile east of Lake Zurich, in Lake County (in Sec. 20, T. 43 

 N., R. 10 E.), which has the following section: 



1. Yellow, pebbly clay 12 feet 



2. Gi^ayish-blue, pebbly clay 88 



3. Fine, gray sand 197 



Depth • • 297 feet 



Altitude of well mouth about 900 feet A, T, 



Mr. Lewis reports three wells near Lake Zurich which ob- 

 tain water in gravel beneatli the blue till at 138, 140 and 150 feet, 

 respectively. Near Hainesville, in Sec. 28, T. 45 N., R. 10 E., he 

 reports a boring to have reached the bottom of the blue till at. 120 

 feet. Below this till is sand for a depth of 167 feet. The sand 

 yielded an abundance of water, but was too fine to be screened by 

 the strainer and no well could be obtained. Near Gilmer, in Sec. 

 3, T. 43, R. 10 E., Mr. Lewis made a well which penetrates stony 

 clays 120 feet and sand 93 feet, obtaining water in coarse sand at 

 a depth of 213 feet. For a mile or more east of Gilmer wells are 

 obtained in gravel beneath blue till at a depth of 75 to 100 feet, but 

 occasionally the blue till extends to a depth of 160 feet. In Har- 

 rington Township, Cook County, T. 42 N., R. 9 E., wells usually 

 penetrate soft blue till to a depth of 100 to 140 feet and occasion- 

 ally 200 feet before reaching a water bearing gravel or a harder 

 till 



Mr. W. Spumer, of Lake Zurich, who has had some experi- 

 ence in boring tubular wells, furnished the following section of his 

 own well near Lake Zurich, in Sec. 17, T. 43, R. 9 E. : 



1. Yellow, pebbly clay 10 feet 



2. Grayish-blue, pebbly clay, about 130 ". 



3. Sand, find blue, pebbly clay in alternate layers of various 



thicknesses . . ■ • ■ 60 " 



4. Sand, becoming coarse and gravelly at bottom 43 '" 



Depth 240 feet 



Mr. Spumer reports that a boring at Ivanhoe, Sec. 22, T. 44, 

 R. 9 E., strikes rock at 290 feet. A well three miles southeast of 

 Wauconda, on the Fletcher Estate, Sec. 32, T. 44, R. 10 E., is 

 reported by Mr. Spumer to have the following section : 



