254 Wisconsin Academy of Sciences, Arts, and Letters. 



between it and the epoch of extreme advance. Its great extent 

 indicates that whatever agency caused the advance was very wide 

 spread, if not continental in its influence. The moraine, there- 

 fore, may be worthy of study in its bearings upon the interesting 

 question of glacial and interglacial periods. 



It will also furnish definite data bearing upon the somewhat 

 mooted question of the origin of the Great Lakes, as well as other 

 questions involving both perglacial and postglacial topography. 



