708 THE ILLINOIS GLACIAL LOBE. 



several wells reach a depth of 125 feet, and occasionally a well is sunk to 

 a depth of fully 200 feet without entering rock. The well drillers report 

 that the upper 100 feet is a softer clay than the lower 100 feet. A buried 

 soil is not uncommon at the base of the soft clay. It is probable that the 

 soil immediately underlies the Wisconsin drift, though it may in some 

 instances be at a lower horizon. 



At Lawndale, situated on the plain immediately outside the Wisconsin 

 drift sheet, at an elevation about 115 feet lower than Atlanta, several wells 

 have been sunk to depths of 65 to 80 feet, mainly through a hard till. 

 Water is found beneath a cemented gravel in a loose gravel or saud. East 

 from this village wells are in several instances 50 or 55 feet in depth, and 

 enter gravel below till. 



At Hartsburg the public well is obtained in sand below till at a depth 

 of 95 feet. Another well in the village is thought to have struck rock at 

 about 100 feet. 



In the vicinity of Emden, on the plain outside the Wisconsin drift, in 

 the north part of the county, tubular wells are 85 to 200 feet in depth with- 

 out entering rock. They usually penetrate alternations of till with sand or 

 gravel beds. Well drillers report that west from Emden the wells frequently 

 penetrate a dry gravel to depths of 90 to 115 feet. Southwest from Emden 

 a sand and blue silt frequently constitutes almost the entire section to a 

 depth of at least 100 feet. A well at Mr. Hubbard's, in sec. 31, T. 21, 

 R. 4 W., 196 feet in depth, has the following section: 



Section of the Hubbard well in Sec. 31, T. 21, R. 4, W. 



Feet. 



Yellow clay, mainly loess 16 



Blue clay, nearly pebbleless, called "blue mud" 150 



Hard blue clay (till?) 30 



Gravel at bottom. 



Total depth 199 



At Lincoln a strong supply of water is obtained from sand at about 65 

 feet after penetrating beds of clay, sand, and gravel. The public water 

 supply is mainly obtained by pumping from neighboring- creeks, though 

 wells have been used. 



In the vicinity of Broadwell the drift is mainly a blue till and is 60 or 

 70 feet in depth. Wells are frequently obtained above the blue clay at 

 depths of 15 or 20 feet. 



