DEPOSITS OF THE LAKE CHICAGO BASIN 



station 39 (Plate I) 

 500 feet south of Touhy Avenue. Surface 595 feet A.T.; 15 feet A.L.M. 



45 



Strata 



Deposit 



Depth 



Remarks 



IV 



Sand loam 



26 



4 



81 



69 

 180 





IH 



Gravel 





n 



Water laid clav 



Upper 40 inches without boulders 



i 



Boulder clay 



and with roots of plants; lower 40 

 inches with few boulders. 





Total thickness.... 





Pocket in stratum II 





Sand 



14 

 15 



•7 

 2 



38 







Gravel and coarse sand 



These pockets are of greater or less 

 size and occur about midway of 

 stratum II. 





Clay, interstratified with sand 



Coarse sand and gravel 





Total thickness.... 





STATION 40 



Touhy A venue, north of bridge. Surface 595 feet A.T.; 15 feet A .L.M. 



Strata 



Deposit 



Depth 



Remarks 



rv 



Silt and loam 



36 



72 

 108 



With shells. 



IH 



Gravel 





II 



Water laid clay 





I 



Boulder clay 







Total thickness ... 







219^ 





