DEPOSITS OF THE LAKE CHICAGO BASIN 



27 



Pisidium pauperculum 

 " splendidulum 

 Muscidium secure 

 Campeloma integrum 

 Goniobasis livescens 

 V aha la tricarinata 



Amia calva 



Either a silurid or a cyprinoid. 



Potamogelon species 

 Najas species 



(Vertebrates) 



Stratum IX 



Potamogeton species 



Sphaerium striatinum 

 Pisidiunt compressum 

 " variabile 

 " scidellatum 

 Campeloma integrum 

 Valvata tricarinata 



Potamogeton species 

 Nymphaea advena 

 Carex sp. 



Spiiaerium sidcatum 



" striatinum 

 Pisidium compressum 



" affine 



" noveboracense 

 Campeloma integrum 



Potamogeton species 



Potamogeton species 



Sphaerium sulcatum 



" striatinum 

 Pisidium compressum 



variabile 

 A mnicola limosa 



Planorbis parvus 

 " trivohis 

 Galba palustris 



" reflex a 

 Lymnaea slagnalis appressa 

 Ancylus parallelus 



Lepomis species 



Hypnum species 



Stratum X 

 (Plants) 



(Animals) 



Najas species 



Amnicola emarginata 



" limosa 

 Somatogyrus subglobosus 

 Physa Integra 

 Planorbis anirosus 

 " deflectus 

 " parvus 



Stratum XI 

 (Plants) 



Scirpus sp. 

 Najas species 

 Typha lalifolia 



Animals (Invertebrates) 



Amnicola limosa 

 Valvata tricarinata 

 Planorbis antrosus 



" trivohis 

 Galba reflexa 



Stratum XII 



Stratum XIII 

 (Plants) 



(Animals) 



Valvata tricarinata 

 Physa Integra 

 Planorbis antrosus 



" campanulatus 



