Plate XII. 



Equus Beds. 

 Pliohippus Beds. 



Miohippus Beds. 

 Oreodon Beds. 

 Brdntotheriura Beds. 



Diplacodon Beds. 

 Dinoceras Beds. 

 (Green River Beds.) 

 Coryphodon Beds. 



Lignite Se 



Pterauodun Beds 



Dakota Groin 



Atlantosaurus Beds. 

 PanranoHon Beds. 



Conn. River Beds. 



Coal Measures. 



Subearbo n i ferou s . 



Upper Devonian. 

 Corniferous. 

 Schoharie Crit. 



Upper Silurian. 



Lower Silurian. 



Eqvu.~. 



Tapir, Peccary, Bison, Llama. 

 Megatherium, Mt/lodon. 



Equut, Tapinu. Elephas. 

 ( PUohippus, Tapiratnts, Mastodon. 

 \ Prvtohippus, Acerutheriuin, Bos. 



Miohippus, Dieeralk&i urn, Thinoht/us. 



(Edentates, M«rnpus. Hyamodon, 

 ■'CEporeodon, Ugracudon. 



Mesohippus, Menodus, Ehtherium. 



Epihippus, Anu/nodon. 



I Tinoceras, Uintatlierium, LimnoJnjus, 

 I Orohippus, Helaleles, (Jolonoceras. 



( Eohippus, Monkeys, Carnivores, Ungulates, 

 ( TTUlodonts, Rodeuts, Serpents. 



lladrosaurus, T>n 



ptosaurus. 



Sirds with Teeth (Odontorntihes,') Ile.ipcrornis, 

 Ichthyornis, Apatornis. Musa*aurs, 



Edestosaurjis, Lestosaurus, Tylosaurus. 

 1'terodactyls, Plesiosaurs. 



( Dinosaurs, 3Sorosaurus, Apatosaurvs, Laosaurus 



\ Xcvosaurus. Turtles. Diplomurus. 



( Mammals, Dryolestes, Slylacodon, Tinodon. 



first Mammals (Marsupials), Dromatherii 



Dinosaur Footprints, AmpJnsaurus. 

 Crocodiles, litludun. 



Reptiles, Xoihodon, CjJienacodon. 



First Reptiles (?) 



First known Amphibians (Labyrinthodonts). 



First known Fishes 



Diagram of stkata to illustrate Vertebrate life in America, 



(After Marsh.) 



