DEPOSITS OF THE LAKE CHICAGO BASIN 



39 



BIOLOC7ICAL REMAINS 





Stratum II 







Plants 





Quercus species 



Animals 





Anodonta grandis 





Valvata Iricarinata 



Pisidium affine 





Physa warreniana 



" compression 





gyrma 



" variabile 





Planorbis antrosus 



Sphaerium sulcatum 





" campanidatus 



Goniobasis livescens 





deflectus 



Campeloma integrum obesum 





" trivolvis 



Amnicola limosa 





Galba palustris 



" lustrica 





Lymnaea stagnalis appressa 



station 28 (Plates I, XIV) 

 3585 feet north of Foster A venue. Surface 590 feet A.T.;10A .L.M. 



Strata 



Deposit 



Depth 



Remarks 



A. V 



Silt 



66 



4 

 23 



4 

 34+ 



Interstratified with sand. 



B. rv 



Sand and gravel 



With Unios. 



c. in 



Silt 



With wood, oak, shells. 



D. II 



Sand and gravel 





I 



Boulder clay 







Total thickness... 







131 





BIOLOGICAL REMAINS 



Stratum III 



Potamogelon species 

 Quercus species 



Anodonta grandis 

 Pisidium affinc 



" compression 



" variabile 

 Sphaerium sulcatum 

 Goniobasis livescens 

 Campeloma integrum obesum 

 Amnicola limosa 

 lustrica 



Crenodonla undulala 

 peruviana 



Plants 



Animals 



Stratum IV 



Valvata Iricarinata 

 Physa warreniana 



" gyrina 

 Planorbis antrosus 



" campanidatus 



" defleclus 



" trivolvis 

 Galba palustris 

 Lymnaea stagnalis appressa 



Amygdalonajas elegans 

 Sphaerium striatinum 



