

STATE OF ILLINOIS 



DWIGHT H, GREEN. Governor 



DEPARTMENT OF REGISTRATION AND EDUCATION 



FRANK G. THOMPSON, Director 



DIVISION OP THE 



STATE GEOLOGICAL SURVEY 



M. M. LEIGHTON, Chief 

 URBANA 



REPORT OF INVESTIGATIONS— NO. 75 



Contributions to Pennsylvanian Paleobotany 

 MAZOCARPON OEDIPTERNUM, sp. nov. 



AND 



SIGILLARIAN RELATIONSHIPS 

 By 



JAMES M. SCHOPF 



'^Lln^,^<ie>^ 



Ols 



'l^/^yly'm 



^AN 



ibf'^ 



PRINTED BY AUTHORITY OF THE STATE OF ILLINOIS* 



URBANA, ILLINOIS 

 19 4 1 



to 



f'fy^' 



mt 



