54 



LIFE OF THE PLEISTOCENE 



III. General Records from the Chicago Basin 



A. IN THE VICINITY OF RIVERSIDE 

 OGDEN DITCH AT AUSTIN AVENUE 



Surface 590 feet A.T.; 10 feet A.L.M. 



Strata 



Deposit 



Depth 



Remarks 



V 



Silt and loam 



24 

 24 

 12 

 12 

 + 



72 





IV 



Silt 



Unios in upper part. 



III 



Peat 





II 



Marl bed 



With shells. 



I 



Clay 







Total thickness.... 





Musculiwm secure 



" truncatum 

 Pisidium mediamum 



" tenuissimum 

 Amnicola limosa 



" lustrica 

 Valvata tricarinata unicarinata 



BIOLOGICAL REMAINS 



Stratum II 



Physa warreniana 

 " walkeri 



Planorbis antrosus 



" campanidatus 

 " parvus 



Galba obrussa decampi 



Stratum IV 

 Pleurobema coccineum magnalacustris Elliptio gibbosus 



Fusconaja rubiginosa Eurynia recta 



Rotundaria lubercidata 



NEAK OAK PARK AND OGDEN AVENUES 



Surface 605 feet A.T.; 25 feet A.L.M. 



Strata 



Deposit 



Black sandy soil 



Yellow sand 



Silt 



Gray sand 



Clay 



Boulder clay 



Total thickness 



Depth 



Remarks 



VI 



V 



IV 



III 

 II 



I 



22 



11 



10 



6 



9 



20+ 



78 



Oxidized. 



With pebbles and shingle. 



