3^ CEKOZOIC MAMMAL HOBTZOXS 



phodontidse; (2) by the sudden appearance of the four Tertiarv 

 orderSj (a) Perissotiaotyla-Equidge'' and -Lophiodontidie, (b) Artio- 

 dactvla. (c> Primates, and (</) Rodentia. 



c 



790' 



315' 

 B 



X<r7i hdo therrizm 

 zoTie 



N 



Ccryphodon (rar^ 

 La m bdo tf ie i m a n prfmaewm 

 Phenocodus 

 Fohijpptjs Cfistatjs 

 Heptodon ^ 



A 

 949' 



Hyopsodus 



Sarcofemar 



Other faunal identifications with Europe are premature. With the 

 exception of the archaic and modem families above hsted, the Euro- 

 pean famihes and subfamihes are different from the American so far 



« The Eqoide of the l^pamacien axe more primitive thaay the oldest Wasatch spee>e&. 



