240 



TEN YEARS PROGRESS IX VERTEBRATE PALEONTOLOGY 



WYOMING CONGLOMERATE 



NONFOSSILIFEROUS Very barren 



Uin ta ih erium 

 {very 3 bun dan t) 



-, . Messtlrhlnus 



Uzrttathemmr Manteoceras 



COTTONWOOD WHIT E LAYER 



'-r-==^^^ — \ Pa/aeosyops 



(very abundant) 



Figure 5. — Generalized Section — Middle Eocene, ti/pical Brid<jcr Series 

 (After Matthew and Granger) 

 Upper : ? Zone 

 Middle: Vintatheriuni Zone 

 Lower: Orohippus Zone 



