GEOLOGICAL REPORT 



OF 



LOCAL, DETAILED OBSERVATIONS, 



IN THE VALLEYS OV THE 



MINNESOTA, MISSISSIPPI, AND WISCONSIN 



RIVERS, 



MADE 



IN THE YEARS 1848 AND 1840, 



UNDER THE DIRECTION OP 



DAVID DALE OWEN, 



UNITED STATES GEOLOGIST. 



BY B. E. SHU M A R D, 



