GEOLOGICAL REPORT 



OF A SURVEY OF PORTIONS OF 



WISCONSIN AND MINNESOTA, 



MADE 



DURING THE YEARS 1847, '48, '40, AND '50, 



UNDER THE DIRECTION OF 



DAVID DALE OWEN, M.D., 



U M I T ED STATES GEOLOGIS T. 



BY JOSEPH G. NORWOOD, M.D., 



