DEPOSITS OF THE LAKE CHICAGO BASIN 



35 



Crenodonta peruviana 

 Goniobasis livescens 



Valvata tricarinala 



Sphaerium rhomboideum 

 Pisidium compressum 



" var labile 



" walkeri 



" politum 



" noveboracense 

 Valvata tricarinala 

 Amnicola limosa 

 Campeloma integrum 



Stratum X 



Physa Integra 



Stratum XII 



Planorbis antrosus 

 Stratum XIII 



Physa Integra 



" warreniana 

 Planorbis deflectns 

 " parvus 

 " trivolvis 

 antrosus 

 " campanulatus 

 Galba palustris 



" reflexa 

 Lymnaea slagnalis appressa 



station 19 (Plates I, XI) 

 2390 feet north of Foster Avenue. Surface 590 feet A.T.; 10 feet A.L.M. 



Strata 



Deposit 



Depth 



Remarks 



A. XVII 



Silt and loam 



23 



yA 



7 



9 

 i 



16 



ny 2 

 i 



16 



5 



i 



1 6 



3H 



i 



ITS 



3 



VA 



18 

 5 

 34 





B. XVI 



Peat 



Vegetation in layers. 

 Bog ore and twigs. 

 With shells. 



C. XV 



Silt 



D. XIV 



Sand 





XIII 



XII 



XI 



X 



rx 



VIII 



VII 



VI 



V 



IV 



Silt 



] 





Sand 







sat 







Sand 





F « 



Silt 



)■ Verv thin beds of sand in silt. 





Sand 







Silt 







Sand 



• 





Silt 





F. 



Sand and gravel 



J 

 Unio bed. 



g. m 



Silt 



With bog ore and wood. 



II 



Sand and gravel 



H. I 



Boulder clay 







Total thickness.... 









128% 





