U.S. GEOLOGICAL SURVEY. 



MONOGRAPH XXXVIII. PL.V. 



Profile across Lake Michigan in latitude 4*-° 15' 



Pleistocene 640 feet 



Profile across Lake Michigan from Sheboygan to Little Sable Point 



POSITIONS OFSECTIONS 



Profile across Lake Michigan from Port Washington to Muskegon 



Surface of lake 579.6 feet. 



Profile across Lake Michigan from Milwaukee to Grand Haven 



Profile across Lake Michigan from Racine to Holland 





Profile across Lake Michigan from Fox Lake to Keele 



Profile across Lake Michigan from Chicago to Benton Harbor 



PROFILES ACROSS THE BED OF LAKE MICHIGAN 



(.Based on soundings given in the UnitedStatesLate Survey Charts.) 



FRANK LEVERETT 

 1898. 



