STATE OF ILLINOIS 

 DEPARTMENT OF REGISTRATION AND EDUCATION 



A. M. SHELTON. Director 



DIVISION OF THE 

 STATE GEOLOGICAL SURVEY 



M. M. LEIGHTON. Chief 



Committee of the Board of Natural Resources 

 and Conservation 



A. M. Shelton, Chairman 



Director of Registration and Education 



Charles M. Thompson 



Representing the President of the Uni- 

 versity of Illinois 



Edson S. Bastin 

 Geologist 



Schnepp & Barnes, Printers 



Springfield, III. 



1926 



53862—850 



