iil 
Map of the 
Glacial Geology 
of Illinois 
Unglaciated Areas. 
Lower Tllinoisan 
Glaciation, 
Middle Mlinoisan 
Glaciation. 
GY aver Tu ROUEN 
f= Iowan and 
SSS Br 
EJ Pre-lowan Glaciation, 
Deep Loess Areas. 
4 Wisconsin Glaciation. 
Moraines in 
Wisconsin Glaciation, 
Bottom-Lands (old and late) 
Sand and Swamp Areas, 
