630 



THE ILLINOIS GLACIAL LOBE. 



In the following list of deep wells the majority of sections were col- 

 lected for the Survey by Prof. J. A. Udden, who has furnished them for 

 publication in this place. It should be noted that where he uses the word 

 " clay" there is usually till, but such is not always the case. 



Table of dee}) wells in Bureau County. 



