726 THE ILLINOIS GLACIAL LOBE. 



feet. The data concerning- the distance to rock are obtained largely through 

 coal shafts and borings. 



INDIVIDUAL WELLS. 



At Mount Auburn, which is situated on a knoll in the north part of the 

 county, wells penetrate a brown, sandy clay to a depth of about 30 feet 

 before entering blue till. On the bordering plain blue till is found at 20 to 

 25 feet, but wells are usually obtained without entering it. The drift in 

 that vicinity is at least 80 feet in depth. 



Near the center of the county, in the vicinity of Taylorville, wells are 

 frequently found at depths of only 15 feet, in sandy beds at the base of the 

 loess. In the city of Taylorville, however, they are usually sunk to depths 

 of 20 to 40 feet. The public water supply is from an open well 30 feet in 

 diameter and 30 feet in depth. The amount of water is so great in this 

 vicinity that much difficulty is experienced in sinking coal shafts. The 

 Taylorville coal shaft has the following section of drift: 



Section of drift in the Taylorville coal shaft. 



Feot. 



Surface clay .- 13 



•Sand nuil gravel 24 



White clay 3 



Black gummy clay 4 



Bowlder clay 17 



Sand and gravel 15 



Sand 15 



Greenish clay 12 



Clay and gravel 12 



Sand and gravel 11 



Total drift 126 



At Pana the coal shaft is reported by Worthen to have penetrated two 

 buried soils, but the writer finds that his upper soil is simply wood embed- 

 ded in till. The lower is a black muck. The import of this section, together 

 with similar sections at other points has already been discussed (p. 107 et 

 seq.). The wells in this city range from 18 to about 50 feet in depth. The 

 waterworks supply is from wells 45 to 48 feet deep, in part 3 inches 'and 

 in part 6 inches in diameter. These wells afforded, during the season of 

 drought in 1895, an average daily consumption of 215,000 gallons. A 

 boring was sunk at this city to a depth of 2,507 feet, but found only a weak 

 supply "!' brackish water after entering the rock. 



