Ill 



Map of the 



Glacial Geology 



of Illinois 



'///A Unelaciated Areas. 

 '///A 



Lower niinoisan 

 Glaciation. 



Middle Illinoisan 

 Glaciation. 



Upper IUinoisan 

 3 Glaciation. 



:. • 



lowan and 

 Pre-Iowan Glaciation 



Deep Loess Areas. 

 Wisconsin Glaciation. 



Moraines in 

 Wisconsin Glaciation. 



Bottom-Lands (old and late) 

 Sand and Swamp Areas. 



