DEPOSITS OF THE LAKE CHICAGO BASIN 

 Stratum VIII 



33 



Sphaerium sulcatum 



rhomboideum 

 solidulum 

 Pisidium compressum 



" splendidtdum 



" var labile 



' ' lirginicum 

 Campeloma integrum 

 Amnicola limosa 



" lustrica 



Vahala tricar inata 

 Physa warreniana 



" integra 

 Planorbis antrosus 



" campamdatus 



" deflectus 



" parvus 



" trivolvis 

 Galba reflexa 

 Lymnaea stagnalis appressa 



station 17 (Plate X) 

 2250 feet north of Foster Avenue. Surface 590 feet A.T.; 10 feet A.L.M. 



Strata 



Deposit 



Depth 



Remarks 



A. XV 



Silt and loam 



20 

 6 



iom 



l A 

 VA 



20 



7 



X 



15 



uj4 



18 



2 



10 





B. XIV 



Peat 





C. XIH 



Silt 



Some bog ore. 



XII 



Sand 





D. XI 



Silt 



Some bog ore. 

 Few shells. 



E. X 



Peat 



f. rx 



Silt 





g. vm 



Silt 





VH 



Sand 



With shells. 



H. VI 



Silt 





K. V 



l. rv 



Silt 



Gravel and sand 



Layers of sand with shells. 

 With Unios. 



M. HI 



Silt 



With wood, bog ore, shel s. 



H 



Sand 





I 



Boulder clay 







Total thickness. ... 







130 A 





