ILLINOIS STATE GEOLOGICAL SURVEY CIRCULAR 496 





Fm 



Member 



Description 



CO 



w 



H 

 Pi 

 W 



CO 



w 



W 



o 

 o 



H 

 CO 

 H 



W 

 hJ 



Pm 



w 



o 

 < 



H 

 CO 



W 



w 

 u 



o 



o 

 pa 





•H 



u 



•H 



Ravinia Sand 



Sand on beaches 



Waukegan 



Dark gray silt and silty 

 clay; silty sand 



Lake Forest 



Gray clay, black beds 

 and mottling 



Winnetka 



Brownish gray clay, some 

 black beds and mottling 



w 

 o 

 <: 



H 



CO 



S3 



i— i 



CO 



53 

 O 

 CJ 

 CO 

 H 

 3: 



o 



<! 



H 

 CO 



PQ 



CO 



S3 

 w 



Q 



<^ 

 > 



Sheboygan 



Reddish brown clay 





Wilmette Bed 



Dark gray clay 







Reddish brown clay 



South Haven 



Reddish gray clay 



•H 

 iH 



cr 



Carmi 



Gray and reddish gray 

 clay, silt, sand, and 

 clay-pebble conglomerate 



T3 



e 



cd 



c 



Two Rivers 1 

 Till 1 



Reddish brown silty 

 clayey till 



TW( 



)creek; 



^N SUBSTAGE 1 



No deposits found 



w 

 o 

 <1 



H 

 CO 



PQ 



CO 



53 

 <: 



O 



Q 

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 3 



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M 



3 



Manitowoc 1 

 Till 1 



Brown to reddish brown 

 silty clayey till 



Shorewood Till! 



Reddish gray to pinkish 

 gray silty clayey till 



Wadsworth Till 1 



Gray silty clayey till 



Fig. 1 - Stratigraphic nomenclature for Pleistocene sediments under southern 

 Lake Michigan (from Lineback, Gross, and Meyer, 1974). 



