LITERATURE. 



The literature on the minerals of this area is very meager. 

 Reference has been made to the following: 



Andrews, Dr. Edmund; Transactions Chicago Academy of 

 Sciences. 



Bannister, H. M.; Economical Geol. of 111., Vol. II, 1882. 

 Guthrie, Ossian; Relics Turned Up in Drainage Canal. 



Hobbs, Prof. Wm. H.; Diamond Field of the Great Lakes. 

 Journal of Geology, Vol. VII., No. 4, 1899. 



Leverett, Frank; Plestocene Features and Deposits Chicago 



Area. 

 Chicago Acad. Sci., Bull. II., 1897. 



Leverett, Frank; Water Resources of Ills. 



On U. S. G. G. R., Vol. XVII., Pt. II. 



Worthen, A. H.; Economical Geology of Ills., Vol. I. 



