GEOLOGICAL SURVEY OF ILLINOIS, 



A. H. WORTHEN, DIRECTOR. 



VOLUME VIII. 



GEOLOGY AND PALEONTOLOGY, 



Edited by JOSUA L1NDAHL, Ph. D., State Geologist. 



GEOLOGY, 



BY A. H. WORTHEN. 



BY A. H. WORTHEN, CHARLES WACHSMUTH, FRANK SPRINGER. 

 E. O. ULRICH AND OLIVER EVERETT. 



WITH AX APPENDIX. 



TEXT. 



PUBLISHED 



BY AUTHORITY OF THE LEGISLATURE OF ILLINOIS. 

 JULY, 1890. 



