CORRELATION OF THE CENOZOIC 



255 



containing a number of very distinctive types of archaic mammals 

 mingled with those of distinctive reptiles {Champsosaurus) found 

 alike in the Puerco of Mexico, the Fort Union of Montana, the 



WYOMING CONGLOMERATE 



NONFOSSILIFEROUS Very barren 



Uin ta therlum 

 {very abundant) 



-. . Mesatirhlnui 



JfvntcLtnervum Manteoceras 



■000 WHITE LAYER 



Palaeosyops 

 (very abundant) 



Fig. 2. — Columnar section of the Bridger formation, Henrys Fork, western^Wyo- 

 ming. After studies by Matthew and Granger, 1902. 



Thanetian of northern France. Thus we believe the opening of the 

 Tertiary admits of close correlation in the Old and New Worlds. 

 The succeeding rich Puerco-Torrejon mammalian life of New Mexico, 

 so far as known, parallels that of the Thanetian (including the 



