DEPOSITS OF THE LAKE CHICAGO BASIN 



37 



station 22 (Plate I) 

 2690 feet north of Foster Avenue. Surface 590 feet A. T.; 10 feet A. L. M. 



Strata 



Deposit 



Depth 



Remarks 



XVI 



Silt and loam 



21 

 12 



13 



a 



Vl 

 16M 



5 



y 2 



4 



2 

 12 

 12 



25 





XV 



Sand 





xrv 



Sand 



With shells. 



xni 



Silt 





xn 



Sand 



With shells. 



XI 



Silt 





X 



Sand 



With shells. 



rx 



Silt 





vin 



Sand 



With shells. 



vn 



sat 



Humerus of duck. 



VI 



Sand 



With shells. 



V 



sat 





IV 



Sand and gravel 



With Unios. 



III 



sat 



With wood. 



II 



Sand and gravel 





I 



Boulder clay 







Total thickness.... 







128H 





BIOLOGICAL REMAINS 



Stratum TV 



Crenodonta peruviana 

 " itndidala 

 Quadrida pustidosa 



" lachrymosa 

 Rolundaria tubercidata 

 Pleurobema coccineum magnalaaistris 

 EUiplio crassidens 



" gibbosus 

 Obliquaria reflexa 



Fusconaja undata 

 Quadrida pustidosa 



Mergits senator (humerus) 



Crenodonta undulata 

 Quadrida pustidosa 

 lachrymosa 



Stratum VI 



Stratum VII 

 Stratum VIII 



A mygdalonajas elegans 

 Lampsilis ventricosa 

 Sphaerium striatinum 



" flavum 

 Pisidium compressum 



" variabile 

 virginicum 

 Campeloma integrum 

 Goniobasis livescens 

 Amnicola limosa 



Elliptio gibbosus 

 Lampsilis luteola 



Elliptio gibbosus 



A mygdalonajas elegans 



Sphaerium flavum 



