GEOLOGICAL SURVEY OE ILLINOIS 



A. H. WORTHEN, DIRECTOR. 



VOLUME IV. 



GEOLOGY AND PALEONTOLOGY. 



GEOLOGY, 



BY A. H. WORTHEN, 



AND ASSISTANTS 



U. M. BANNISTER, FRANK H. BRADLEY. II. A. 



PALEONTOLOGY. 



Section!. DESCRIPTIONS OF VERTEBRATES, 



BY J. S. NEWBERRY AND A. H. WORTHEN. 



Section II. DESCRIPTIONS OF PLANTS, 



BY LEO LESQUE11EUX. 



ILLirSTRATKl) 



BY THE WESTERN ENGRAVING COMPANY, CHICAGO. 



PUBLISH KI > 



BY AUTHORITY OF THE LEGISLATURE OF ILLINOIS. 



1870. 



