557 



I 6b 



TiO.lU 



STATE OF ILLINOIS 



ADLAI E. STEVENSON, Governor 



DEPARTMENT OF REGISTRATION AND EDUCATION 



NOBLE J. PUFFER, Director 



DIVISION OF THE 



STATE GEOLOGICAL SURVEY 



M. M. LEIGHTON, Chief 

 URBANA 



BULLETIN NO. 74 



PENNSYLVANIAN SPORES OF ILLINOIS 



AND 

 THEIR USE IN CORRELATION 



BY 

 Robert M. Kosanke 



PRINTED BY AUTHORITY OF THE STATE OF ILLINOIS 



URBANA, ILLINOIS 



1950 



ILLINOIS [GAL 



SURVEY L RY 



AUG 25 1950 



