220 THE ILLINOIS GLACIAL LOBE. 



depth, and on B. F. Hollis's farm, in sec, 31, two wells are 190 feet in depth, 

 without reaching- rock. The drift is largely a blue till and but a small part 

 is thought to belong to the early Wisconsin. It is described to be mainly 

 hard till below a depth of 40 feet. F. G-. Seymour has a well in sec. 6, 

 T. 19, R. 7 E., 215 feet in depth, which is similar to the wells on the Hollis 

 farms. 



At Monticello the city water supply is from two wells 212 and 303 feet 

 in depth, neither of which enters rock. The early Wisconsin drift here is 

 apparently but 20 feet thick, the wells being on low ground near the San- 

 gamon River. The following is the record of the deeper well as published 

 in the Piatt Independent soon after the completion of the well in 1891: 



Section of a waterworks toell at Monticello, Illinois. 



Feet. 



Black lo? in 3 



Yellow clay 10 



Blue clay (gravelly) 7 



Brown peaty loam (Peoriant) 7 



Sand and gravel 2 



Blue clay 11 



Sand, gravel, and water 5 



Silt 12 



Sand, gravel, and water 55 



Hard blue clay (pebbly " bardpan ") 49A 



Quicksand 75i 



Sand and gravel 64 



Coarse gravel 2 



Total 303 



Iii the veins of water above the "hardpan" the water is less suitable 

 for culinary and laundry purposes than in those below, because of greater 

 hardness. Both wells are, therefore, sunk to a coarse gravel in the lower 

 water bed. 



At Bement a well in the business part of town struck rock at 222 feet 

 and is 225 feet in depth. Wells at the waterworks, the railway station, and 

 the mill obtain a good supply of water at 140 to 150 feet, after penetrating 

 a large amount of blue till. It is not certain that the Wisconsin drift has 

 -,i great a depth as \~> {) feet at this point, the records of wells being imper- 

 fect. Ar the cemetery, 2 miles north of Bement. near the crest of the Cerro 

 Gordo moraine, a well 221 feet in depth is mainly through blue till and does 

 not reach rock. 



At Cerro Gordo there is a nearly solid bed of blue till to a depth of 

 150 feet, and strong- wells are seldom obtained at less depth. That the 



