GEOLOGICAL PAPER; 



109 



is probable that the sand found in the canal, which is 4>2 miles 

 east of the Glenwood shore line, was deposited just previous to 

 the first low water stage, as a bed of sand of this thickness would 

 scarcely form in fift>- to sixt}- feet of water nearly five miles 

 ofT shore. 



Stat\on 1G 



OUTFACE 5S5 



19 



9M 



■ '•il....CLA"ltY LOAM 

 >^ blLT(a»iDit£o! 



..Peat 



Lower Tolleston 

 /o feet deep 



NrPiSSiN<T &ReAT LAKE* 

 Swamp Moll.ussS 



/.. Low V'/(7ER 



Middle. Tolleston 



iZTEETDLE-P. L^ui^NQuiN 



L.H\iJtHiAHSia Bj-g^^^^^g -g^^AtS ^ , /-Low vwateR Cpo%>>t>(e. Vavi »ur<oie) 





-gg^^g^^^ggsL- 5 1 LT(oxioizx.o) 



(omoii-EO) 

 -UniO 8ED 



UpplrTolleston 



tOFZSrt OZi-P fjVi-8lRDRE*«iNS 

 HtAYiC'NiOi C»mpelOMA, Sf*«*'>'M, 



Z-h 



.Gravel- Sand ( Calumet 



I 35f£tTDtEP 



) NoLi'E 



_SilT(wocd-) LPcst Glenwood 



Shallow water Msu-uiKS 



Sand \ GLENVJOOD °Y^ 



55-60 FECT D££P 

 No LIFE. 



Bowlder CUY \ DRIFT (ground Moraine) 



Figure 1. Section through post-glacial fluviatile deposits of Wilmette 

 Bav. Glacial Lake Chicago. 



Above the sand deposit occurs a bed of silt ten to eighteen 

 inches in thickness. This deposit is filled with moUuscan remains 

 of species which live in shallow water usually not exceeding ten 

 feet in depth. The following species are represented by thou- 

 sands of individuals, showing that life was notably abundant: 



