554 



THE ILLINOIS GLACIAL LOBE. 



Peoria it averages about 7 feet per mile, and is not greatly different in por- 

 tions of the State farther north. The eastward descent across western 



f*» COWS'* f 



: 



Illinois appears to continue gradual as far south as the Cap au Gres 

 upheaval, near the mouth of the Illinois, and, so far as known to the writer, 



