^ EEPOET 



\|\ 



GEOLOGICAL SURVEY 



OF THE 



STATE OF IOWA, 



TO THE THIRTEENTH GENERAL ASSEMBLY, JANUARY, 1870, CONTAINING 



RESULTS OF EXAMINATIONS AND OBSERVATIONS MADE WITHIN 



THE YEARS 1866, 1867, 1868, AND 1869. 



By CHARLES A. WHITE, M. D. 



GEOLOGICAL COUPS: 



Charles A. "White, - State Geologist. 

 Orestes H. St. John, Assistant. 



Rush Emery, - - - Chemist. 



VOLUME I. 



DES MOINES: 



PRINTED AND PUBLISHED BY MILLS & CO., FOURTH STREET. 



1870. 



