DEPOSITS OF THE LAKE CHICAGO BASIN 



25 



STATION 3 



300 feet north of Foster Avenue. Surface 585 feet 8 in. A. T;. 5 feet 8 in. A. L. M. 



Strata 



Deposit 



Depth 



Remarks 



VII 



Surface soil, silt and loam 



29 



24 

 15 



+ 

 + 

 + 



68^ 





VI 



Sand 





V 



Peat and silt 



With shells and plants. 



IV 



Silt 



III 



Gravel and sand 



Water line of canal. 



II 



Silt 





I 



Boulder clay 







Total thickness.... 





BIOLOGICAL REMAINS 



Stratum V 



(Plants) 

 Potamogeton species. 



(Animals) 

 Pisidium compressum Uevigatum Planorbis antrosus 



" splendidulum " campamdatus 



Amnicola limosa " exacuous 



Valvata tricarinata " parvus 



Physa ivarreniana " triwlvis 



Segmentina armigera Galba reflexa 



Ancylus parallelus Lymnaea stagnalis appressa 



Vertebra; of a fish 



