CENOZOIG ERA. AGE OF MAMMALS. 



367 



cially iii the Miocene. The Coos Bay coal of Oregon, and 

 the imperfect seams of the Contra Costa Range, Califor- 



TS1. PLIOCENE 

 '' JOHN DAY, V 



tiia, are Miocene. The lone brown coal of Amador 

 County, California, is still more recent, probably Plio- 

 cene. 



