UNIVERSITY OF ILLINOIS 
AGRICULTURAL EXPERIMENT 
           STATION 
 
 
  .SEPI4Ei6OI! 
          6 _ 
noLi'ý 
 
 
   GENERAL SURVEY 
   SsMAP 
 
 
   ILLINOIS 
(CHIEFLY AFTER F. LEVERETT'S 
        GLACIAL MAP.) 
 
 
C AS S 
 
 
U nglaciated areas 
E    Illinoisan moraines 
     (Win Illinoisan glaciation) 
EE   Lower Illinoisan glaciation 
j Middle Illinoisan glaciation 
     Upper Illinoisan glaciation 
SPre-Iowan glaciation 
UIowan glaciation 
     Deep loess areas 
     Early Wisconsin moraines 
     (in- early Wisconsin glaciation) 
U     Late Wisconsii moraines 
     ian lWte Wisonsin glaciation) 
D     Early Wisconsin glaciation 
 
      Late Wisconsin glaciation 
W    Old river bottom and swamp areas 
SSand, late swamp and bottom lands 
 
 
4 
 
 
     -WZASHXICT 1T 
31 
 
  --1-IQ 
 
 
"SALINhE 
 
 
  Investigation of 
     Illinois Soil 
   Y      G      PBY 
KCYRIL G. HOPKINS