LAKE CHICAGO AND ITS OLD SHORE LINES 



85 



^v&dat<£ 



Fig. 53. — Map of the Chicago plain and adjacent moraine. 

 XXX Land bordering Lake Chicago at the Glenwood stage. 

 / / / Added land as the lake dropped to the Calumet stage. 

 W \ Land added by drop to ToUeston stage. 



Land added by drop to present level in white. 



Sand bars dotted. 



