III 
Map of the 
Glacial Geology 
of Illinois 
Unglaciated Areas. 
(UM tizzeeions 
= Middle Ilinoisan 
Glaciation. 
YU 
ES Mee eS aaieeont 
Deep Loess Areas. 
A Wisconsin Glaciation. 
Moraines in 
Wisconsin Glaciation. 
Bottom-Lands (old and late) 
‘| Sand and Swamp Aveas. 
ul 
