100 



LIFE OF THE PLEISTOCENE 





Post- 

 Glacial" 



Recent 





Lake 

 Michigan 



Small 

 lakes 



Rivers 



Sloughs; 

 swamps 



Galba reflexa walkeri 







X 

 X 

 X 



X 

 X 





" exilis 









" kirtlandiana 









" catascopium 



X 

 X 



X 

 X 



X 





" woodruffl 















This rich and varied fauna of 115 species and 24 varieties reached its 

 present location by way of the Chicago outlet from its place of refuge beyond 

 the border of the Wisconsin ice sheet. Of the 139 species and races included 

 in the table, 98 have been observed in the sediments of glacial Lake Chicago. 

 15 species (including 6 Pisidia) are known from the postglacial deposits, but 

 have not yet been found living in the waters of the recent lakes and rivers. 

 No land mollusks have been observed in the postglacial deposits, altho these 

 animals doubtless lived on the shores of the lake as they were forest-covered. 

 Loess deposits are known to be present near Palos Park, 66 but no mollusks 

 have been observed. 



i 



b. Higher Invertebrates and Vertebrates of Post-Wisconsin Deposits 



The other members of the fauna of the post- Wisconsin deposits, tho small 

 in number of species, are of special interest. These are: 



Crustacea 

 Cambarus blanditigi acutus 



Insecta 

 Donacia proximo. 

 Vertebra ta 

 Pisces 

 Amla calva 

 Lepomis species 

 Silurid or Cyprinoid 



Aves 

 Mergus serrator 



Mammalia 

 Fiber zibethicus 

 Mamtnut americanum 

 Elephas columbi 



" primigenius 

 Odocoileus mrginianns 



•' Personal communication from Dr. W. W. Atwood. 



