702 THE ILLINOIS GLACIAL LOBE. 



INDIVIDUAL AVELLS. 



In the vicinity of Ludlow, in the north part of the county, at an 

 altitude about 800 feet above tide, several wells have been sunk to a 

 depth of 150 feet without reaching rock. They are largely through till. 



A well at F. Delaney's near Dickerson, in the northwest part of the 

 county, at an altitude about 750 feet above tide, reached a depth of 280 

 feet without encountering rock. 



In the vicinity of Rantoul the wells range from 80 to 200 feet in drift. 

 The public water supply for this village is obtained from a well 135 feet in 

 depth, mainly through blue till. A prospect boring for coal at this village, 

 reported in the Geology of Illinois, is said to have reached rock at a depth 

 of 80 feet. The report, however, is based upon rather imperfectly sup- 

 ported data, the results of the boring having been kept secret for about 

 twelve years before they were communicated to the Survey. 1 



Near Grifford, in the northeast part of the county, on the crest of the 

 outer ridge of the Bloomington morainic system, a well is reported to have 

 reached a depth of 260 feet and little or no rock was penetrated. No 

 more definite record of the well was obtainable. 



In the vicinity of Mayview several wells have been obtained in sand 

 and gravel below till at depths of 80 to 100 feet. A well at the residence 

 of T. Hissong in Mayview reached a depth of 118 feet. 



The cities of Champaign and Urbana have a common public water 

 supply obtained from seven wells sunk to depths of 157 to 162 feet in the 

 glacial drift. The combined daily capacity of the wells is nearly a million 

 gallons. The wells range in diameter from 5 to 8 inches. Two coal bor- 

 ings at Urbana show a difference of 165 feet in the distance to rock, one 

 entering rock at 100 feet, the other at 265 feet. The drift section of the 

 deeper one, furnished by Prof C. W. Rolfe, appears on page 235. 



At Champaign a deep boring prospecting for coal and gas, as indi- 

 cated in the section on page 234, has penetrated a deposit of drift even 

 thicker than in the deepest boring at Urbana, it being 300 feet, but the 

 altitude is about 30 feet higher than at the Urbana boring, thus giving the 

 rock surface nearly the same altitude at both places. 



At Sidney the dug- wells are about 30 feet and bored wells 30 to 70 



1 Geology of Illinois. Vol. IV, p. 274. 



