SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOLUME 123, NUMBER 7 



(End of Volume) 



Cfjarles; ®. anb iflarp Uaux IMaicott 

 l^essearcf) Jf unb 



EARLY CENOZOIC VERTEBRATES 



IN THE RED CONGLOMERATE 



AT GUANAJUATO, MEXICO 



(With 1 Plate) 



By 

 CARL FRIES, JR. 



U. S. Geological Survey 



CLAUDE W. HIBBARD 



University of Michigan 

 AND 



DAVID H. DUNKLE 



U. S. National Museum 





(Publication 4181) 



CITY OF WASHINGTON 



PUBLISHED BY THE SMITHSONIAN INSTITUTION 



FEBRUARY 17, 1955 



