Uecent. 



Post Tertiary. 



Equus Beds. 

 Pliohippus Beds. 



Miohippus Beds. 

 Oreodon Beds. 

 Brontotherium B. 



Diplacodon Beds. 

 Dinoceras Beds. 

 (Green River B.) 

 Coryphodon Beds 



Lignite Series. 



Pteranodon Beds. 



Dakota Group. 



^.y.; : '. \. :■-■■:.-.;.. ■■ ■■.-. . .'.'-./Xji;^ 



Equus, Tapirus. Elephas. 

 Pliohippus, Tapiravus, Mastodon. 

 Protohippus, Aceratherium, Bos. 



Equus. 



Tapir, Peccary, Bison, Llama. 

 Megatherium, Mylodon. 



Miohippus, Diceratherium, Thinohyus, 



(Edentates (Moropus), Byosnodon, 

 \ Eporeodou, Hyracodon. 



Mesohippus, Menodus, Elotherium. 



Kpihippus, Amynodon. 



Tinoceras, Uintatherium, Lirnnohyus, 

 Orohippus. Helaletes, Coionoceras. 



\ Eohippits, Monkeys, Carnivores, Ungu- 

 > lates, Tillodonts, Rodents, Serpents. 



Hadrosaurus. Dryptosaurus. 



Birds with Teeth ( Odontorn ithes) , Jfesper- 

 ornis, lchthyornis. Mosasaurs. 



Edeswsaurus, Lrs-t.osaurus, Tylosaurus 

 Pterodactyls, Plesiosaurs. 



Atlantosaurus B. 



Dinosaurs, Apatosaurus, Allosaurus, 

 flanosaurus. Turtles. Diptosaurus. 



Conn. River Beds. 



First Mammals (Marsupials), (Droma- 



therium). 

 Dinosaur Footprints, Ampkisaurus. 



Crocodiles (tteiodon). 



^^^H Carboniferous. 



Coal Measures. 



Subcarboniferous 



First Reptiles (?) 



First known Amphibians (Labyrinth- 

 odonts). 



Corniferous. 

 Schoharie Grit. 



First known Fishes. 



Upper Silurian. 



Lower Silurian. 



Section of the Earth's Crust. 



TO ILLUSTRATE VERTEBRATE LIFE IX AMERICA. 



