280 



THE AGE OF MAMMALS 





200 



200 



AferycocTioems 

 zorve 



Parahippus 

 Moropus 



Merycochcerus 

 (abundant and 



characteristic) 

 ?Merychyus 

 Blastomeryx 

 Oxydacty/us 

 Testudo 

 Amphicyort 

 (pnmitit'e stage) 



LEVEL OFAG/iTE SPRING 



D/'cera therium 



FOSSIL QUARRY 



Moropus 

 Dinohyus 



?Merychyus 

 (pnmitii'e stage) 



Promerycochoerus 

 van tasselensis 



Parahippus 



Promerycochoerus 

 Carriheri 



Mesoreodon 

 Protomeryx 



■6 ■■ P^ 6>o'. o'„ o .- .' P. '.o- <3 '■ 

 ■ ■"■°- 'A''^.:-S-'.--o ■■■'<>'■ .'yi-o- a- -'a''- 



° : . 6- ■ o ■ o vV ■ ■ o ■■• '^- n- o • ■' 'O :'■ ■ "^ o'- ■ 



•.6 



Dlceratherium 



Leptauchenia 

 ? Mesoreodon 



■'0 ■'■ 



o-.q-.^^.y-.o-.- 



9--^ 



-Zeptaitc7 ienz a= 



rBRULE- 



Leptauchenia 



By permission of the U.S. Geological Survey. 



Fig. 139. — Scale section corresponding with section A near Harrison in Fig. 99. 



After Peterson. 



