GEOLOGICAL SURVEY 



STATE OF IOWA: 



EMBRACING THE RESULTS OF INVESTIGATIONS MADE 

 DURING PORTIONS OF THE YEARS 1855, 56 & 57. 



JAMES HALL, State Geologist; 

 J. D. WHITNEY, Chemist and Mineralogist. 



VOLUME I. 



PART II : PALEONTOLOGY. 



PUBLISHED BY 



AUTHORITY OF THE LEGISLATURE OF IOWA. 

 1858. 



