WELLS OF KANE COUNTY, ILLINOIS. 599 



Kaneville wells have a depth of 35 or 40 feet and penetrate both gravel 

 and till. At Charles Benton's, east of Kaneville, in sec. 25, a well 54 feet 

 in depth is thought to have struck rock. It penetrates clay 25 feet, sand 

 25 feet, gravel 4 feet. Near the center of the township, in sec. 15, a well 

 on a knoll is entirely in gravel to a depth of 44 feet. 



In Sugar Grove Township the thickness of drift varies from 16 feet or 

 less up to fully 75 feet. In the village of Sugar Grove the deepest wells are 

 50 to 70 feet without entering rock. In some instances they are through 

 gravel and in others mainly through till. A well at Mr. Hatch's, in sec. 7, 

 70 feet in depth, obtains water in gravel at bottom and penetrates alterna- 

 tions of cla}' and fine sand. Mr. Dorr, in sec. 8, has a well in a basin at 

 the side of an esker which is entirely in clay to a depth of 20 feet. On 

 the borders of the basin the drift is gravelly, like that of the esker. Mr. 

 S. E. Sheppardson, in sec. 16, has a well 75 feet in depth, which is entirely 

 through sand and cemented gravel. Mr. Chapman, near Sugar Grove, has 

 a well 90 feet in depth, which entered rock at 60 feet. It was mainly 

 through till. Mr. Potter, in sec. 32, has a well on a knoll, which reaches a 

 depth of 70 feet without entering- rock. The upper 40 feet is gravel and 

 sand; the remainder is sandy till. 



At Aurora the public water supply is from a series of deep artesian 

 wells 1,388, 2,270, and 2,255 feet in depth. The first obtains water from 

 the St. Peter and the others from the Potsdam sandstone. The water has a 

 head about 60 feet above the surface, or 710 feet above tide. An analysis 

 of the water from each well appears in the Seventeenth Annual Report of 

 this Survey. 1 The water from the St. Peter sandstone contains a remarka- 

 bly small amount of saline matter and is of excellent quality for domestic 

 use. The Potsdam water is more saline than the water from the St. Peter 

 sandstone. Private wells are obtained in Aurora and vicinity at about 40 

 feet in gravel. Rock is extensively exposed along Fox River in the city 

 and below as far as the county limits. 



DEKALB COUNTY. 

 GENERAL STATEMENT. 



Dekalb County is situated immediately west of Kane and near the 

 middle of the second tier of counties from the north. It has an area of 

 650 square miles, and Sycamore is the county seat. The greater portion of 



1 Part II, p. 820. 



