THE EOCENE OF EUROPE AND NORTH AMERICA 



139 



Eocene which renders time correlation very difficult. There are some 

 interesting contrasts similar to those which generally distinguish a penin- 

 sular from a continental fauna. The archaic herbivores (Amblypoda), 

 which form the most striking feature of the Rocky Mountain fauna, are 



Fig. 47. — Divi'ii^rni'c ul Europe and Aiiicric:i. UpinT Ivicciic titaiiothcrcs, found only in 

 North America. To the left the broad-skulled Manteoceras ; to the right the long-skulled Do- 

 lichorhinus. After original by Charles R. Knight in the American Museum of Natural History. 



entirely unrepresented and probably extinct in Europe. The archaic 

 carnivores, which are represented by three powerful family types in the 

 Rocky Mountains (Mesomjx, Patriofelis, Sinopa), emhrace only a single family 

 (Hyaenodontidse) in Europe. Altogether the North American fauna is 

 much more diversified and more continental and cosmopolitan than the 

 European. The European stages and their American parallels may be 

 approximately correlated as follows: 



Upper Eocene 



Middle Eocene 



A)7ierican 



Formations 

 Upper Uinta 

 Middle Uinta 

 Upper Washakie 



Lower Uinta 

 Lower Washakie 

 Upper Bridgcr 



Lower Bridger 

 Upper Huerfano 



American 



Life Zones 

 Diplacodon Zone 

 Eobasileus Zone 

 Eobasileus Zone 



Uintathcrium Zone 

 Uintatherium Zone 

 Uintathcrium Zone 



Orohippus Zone 

 Orohippus Zone 



Approximate Euro- 

 pean Stage 



LUDIAN 

 LUDIAN 

 LUDIAN 



Bartonian 

 Bartonian 

 Bartonian 



Lutetian 



Lutetian 



