694 THE ILLINOIS GLACIAL LOBE. 



The Waterworks Manual reports that Lexington has its public supply 

 from a well, but the depth is not given. 



At Colfax borings for coal entered rock at 100 to 125 feet, but wells 

 are usually obtained at moderate depths, seldom exceeding 40 feet. The 

 drift contains considerable sand in that vicinity. The record of a well 

 about 4 miles west of Colfax shows scarcely any till in a depth of 115 feet, 

 at which depth rock was entered. 



The city of Bloomington obtains its water supply from a large well 60 

 feet in depth, located in the valley of Sugar Creek. The well penetrates 

 about 33 feet of surface gravel, beneath which is blue clay and water- 

 hearing gravel at 60 to 65 feet. Prospect borings show a belt of gravel 

 about 2,000 feet in width leading down the creek valley from the vicinity 

 of the waterworks. Except in seasons of extreme drought, such as that of 

 1894 and 1895, the waterworks well can be depended upon to furnish an 

 adequate supply for the city. The coal shaft near the Chicago and Alton 

 Railway station, at an altitude of about 750 feet, entered rock at a depth of 

 161 feet, penetrating the following drift beds: 



Section of drift beds in a coal shaft in Bloomington, Illinois. 



Feet. 



Loam and gravel .---- 20 



Bine till - 61 



Sand I 



Bine till - 76 



Total drift - - 161 



In Vol. IV of the Geology of Illinois a coal shaft at Bloomington, 

 one-half mile north of the Chicago and Alton Railway station, is reported 

 to have penetrated 252 feet of drift, as follows: 



Section in coal shaft one-half mile north of preceding. 



Feet. 



Brown clay 10 



Bine clay 40 



Gravelly hardpan 60 



Black mold with pieces of wood 13 



Hardpan and clay 89 



Black mold 6 



Bine clay 34 



Sand, bnft* and drab, with fossil shells 2 



Total drift 252 



A well in the east part of Bloomington 140 feet in depth is reported 

 bv the driller to have penetrated a "blue rock" the lower 40 feet. It is 



