Prepared for Field Trip, Pander Society 



North- Central Section, Geological Society of America 



DeKalb, May 11-14, 1972 



OFFICE COPY 



PENNSYLVANIAN CONODONT 

 ASSEMBLAGES FROM 



LA SALLE COUNTY, 



NORTHERN ILLINOIS 



Charles Collinson 

 Matthew J. Avcin 



Illinois State Geological Survey 



Rodney D. Norby 



University of Illinois 



Glen K. Merrill 



University of Texas at Arlington 





linois State Geological Survey Guidebook Series 10 



