PAPERS PRESENTED AT GENERAL SESSIONS 71 



Jul- _ from the fresh: r of the 



moraines from the meager amount of gullying which has 

 taken pb spt under speeial conditions, and from the 



small amount of slope wash which fa ae on, it ap- 



the inci .mith responsible for the 



melting of the ice made possible also a rather prompt re- 

 invasion of the plant kingdom followed no doubt also 

 rather promptly by a return migration of the animal life. 

 We now the ::gth of time that has 



transpir a glacial j but recent 



seen: >w that it has mething like - 



years since the building of the outer moraine of 

 the late Wisconsin, which would coi ad with the 



st Chicago moraine which lies 

 .in. 



