THE EOCENE OF EUROPE AND NORTH AMERICA 



165 



by species closely allied to those of the Upper Briclger and in some cases 

 identical with them. None of these genera, however, excepting the insec- 

 tivore Hyopsodus and the rodent Pornmys survive into the Upper Uinta. 

 A similar fauna is contained in the little-known Lower Uinta beds, south 

 of the Uinta IVIountains. These three levels (Upper Bridgcr, Lower Washa- 

 kie, Lower Uinta) may all be regarded as marking the c 1 o s e o f the 



Fig. 65. — Pdlrioftlis, a powerful, jascuar-likc croodont of the Middle Eocene. Above : 

 Skeleton of Patriofdix vorax from the Bridgcr. Below : Restoration of the same l)y (""harles 

 R. Knight. Both in the American Museum of Natural History. 



Middle Eocene, although the distinction between Middle and Upper is 

 naturally a somewhat artificial one and employed for purposes of con- 

 venience. 



(3) Lower Uinta: Uintatherium Zone. — While the L^pper Bridger and 

 Lower Washakie deposits were accumulating north of the Uinta Mountains, 

 the base of the Uinta series began to form south of this range, in north- 

 eastern Utah. The lowermost beds (Uinta A) are composed largely of 



