s 



14. GS: 

 CIR 32& 



STATE OF ILLINOIS 



DEPARTMENT OF REGISTRATION AND EDUCATION 



SPECHTS FERRY (MIDDLE 

 ORDOVICIAN) BRYOZOAN 

 FAUNA FROM ILLINOIS, 

 WISCONSIN, AND IOWA 





T. G. Perry 



SU* 



1 8 



K^ 



he 



o J° Z 



ILLINOIS STATE GEOLOGICAL SURVEY 

 URBANA 



1962 



CIRCULAR 326 



