DEPOSITS OF THE LAKE CHICAGO BASIN 



29 



stations 9 and 10 (Plates I, VII) 

 1402 and 1420 feet north of Foster Avenue. 590 feet A . T. 



Strata 



Deposit 



Depth 



Remarks 





9 



10 





XTV 



Silt and loam, black 



5 



5 





XIII 



Silt, yellow 



9 



9 





XII 



Silt, oxidized 



23 

 3 



23 



Vs 

 3 



Beds of shells every 2-3 inches. 



XI 



Sand 





X 



Silt 



With plants and shells. 



rx 



sat 



56 



56 



With plant stems and few 











shells. 



VIII 



Silt and fine sand 



14 



14 



Unio bed; few pebbles; wood. 



VII 



Silt, peaty 



5 



5 



With plants, shells, wood. 

 With shells. 



VI 



Sand, coarse 



1 



4 



V 



Silt 



) 



rv 



Sand, coarse 



l 





/■With pieces of wood. 



m 



Silt 



l 



6 

 10+ 



4 

 10+ 





ii 



Gravel 



/ 



i 



Boulder clay 







Total thickness 

 1 







135% 



133% 







BIOLO 



GICAL RE 



MAINS 





Si 



.ratum V 



II 







(Plants) 





( 



htercus species 





Populus balsamifera 



i 



y icea mariana 



(Animals 



Car ex sp. 

 ) 



i 



>phaerium sulcatum 





Physa warreniana 





" acuminatum 





Ancylus fuscus 





" solidulum 





" parallelus 





" flavum 





Segmentina armigera 





°isidium affine 





Planorbis antrosus 





" variabile 





" campanulatus 





" species 





" deflectus 





Yaliata tricarinata 





" exacuous 





Amnicola limosa 





" parvus 





" lustrica 





" trivolvis 



< 



loniobasis livescens 





Galba reflexa 



< 



Zampeloma integrum 



S 



tratum V 



Lymnaea siagnalis appressa 

 III 



t 



7 usconaja undala 





A mygdalonajas elegant 



( 



Zrenodonia undtuala 





Pro 



pier 'i alali 



