Equus Beds. 



Equus, Tapirug, EUpkas. 

 Pliohippus Beds. 



PUMppug, Maxtudan, Bos, 



Miohippus Beds. 



MiohxppUB, IHceratherivm, TJ 

 Oreodon Beds. 



Edentates, Hyaenodon, Hyracod' 

 Brontotheiiuin Beds. 



Mesohippus, Menodttg, Elotker 



Diplacodon Beds. 



EpihippuB, Amynodon. 

 Dinoceras Beds. 



Tinoceras, Vintatlierium, Lii 



Orohippus, Betaletes, Culoiw 

 Coryphodon Beds. 



Eohipput, Monkeys, Carnivc 

 Serpents. 



I, Ungulates. Tillo'ionte, Rodenti 



Lignite Ser 



->igni 

 Syd, 



Drypt09aurU9. 



?ianodoii Beds, 

 ;irdfl with Teeth. Hesperor 

 Pterodactjls, PlesiosaurB. 



Connecticut River Beds. 

 First Mammals (Marsupials), (/>i 

 Dinosaur Foot-prints, Amphisaur 

 Crocodiles (BeUdon), 



Corniferous. 



Upper Silurian. 

 Lower Silurian. 



Laurentian. 



Fig. 302. -Section of the earth's crust, to illustrate vertebrate life in America. 



(After Marsh.) (From Le Conte's Geology, American Book Co., Publishers.) 



393 



