WELLS OF TAZEWELL COUNTY, ILLINOIS. 691 



of Washington, reached a depth of 262 feet without entering rock. Several 

 changes in .structure were noted during- the boring. 



At Morton the waterworks well is 230 feet in depth and terminates in 

 sand. Three other wells within 2 miles northwest reach about the same 

 depth without entering rock, and have similar sections. The waterworks 

 well is reported to have penetrated 30 feet of yellow clay and sand at sur- 

 face, beneath which was 70 feet of soft blue till, belonging apparently to 

 the Shelby ville drift sheet. The next 100 feet is mainly a hard gray till, 

 but includes about 20 feet of sand. The lower 30 feet is white sand. 



At Pekin the public water supply is obtained from the gravel of the 

 Illinois River Valley- A large w.ell, 50 feet in diameter, is excavated to ;i 

 depth of 30 feet, in the bottom of which several small wells are driven f><> 

 feet farther. The wells will yield 3,000,000 gallons a day. Distilleries at 

 this city use the Illinois River water. An artesian well sunk on a high 

 terrace in the east part of the city at the City Park reached a depth of 850 

 feet, and struck salt water at about 500 feet. The well mouth is 100 feet 

 above the level of the Illinois River, or 525 feet above tide, and a flow of 

 water is obtained. The drift is about 200 feet in thickness. Within a half 

 mile east of the well rock is exposed in the bluff at an altitude 25 feet higher 

 than the well mouth. 



At Delavan the public water supply is from a well obtained in sand and 

 gravel at a depth of 160 feet. A well was sunk by this village to a depth 

 of 241 feet without entering rock, and penetrated the following beds: 



Section of a boring at Delavan, Illinois. 



Feet. 



Yello w till '. 15 



Blue till 60 



Black inuck with wood 6 



Green mucky clay 8 



Gray sandy till 30 



Gray sand 122 



Total depth 241 



The muck found beneath the blue till is probably at the base of the 

 Wisconsin drift sheet. A well 4 miles northeast of Delavan at an altitude 

 about 80 feet above the village, or 700 feet above tide, struck rock at a 

 depth of 313 feet. The drift was mainly till to a depth of 140 feet, and 

 included a bed of black muck near the base. The remainder of the sec- 

 tion is principally sand, as at Delavan. 



