TERTIARY OR NEOZOIC ERA 

 Neozoic (Lyell) Formations 



599 



Great Plains 



Sheridan-Rock Creek 



Loup River— Archer- 

 Blanco 



fc> 



Mammal Zones 



Champlain 



Glacial 



Equus 



Glyptotherium 



European analogues, 

 De Lapparent's Traite 



Sicilian 



Astian 



Plaisancian 



Ogalalla-Clarendon 

 Pawnee-Deep River 



gj ( jering-Monroe 

 J5 -I Harrison-Rose 

 u { Bud 



= f 



- Upper Brule 



<v 



> Lower Brule 



5 

 3 



Chadron 



Protohippus-Procamelus 

 Ticholeptus 



Mervcochoerus 

 Diceratherium 



Leptauchenia 



Protoceras 



Oreodon-Metamynodon 



Titanotherium 



Break 

 Uinta 



Washakie 

 Bridger 



Wind River-Green River- 

 Huerfano 



Diplacodon 



Eobasileus 

 Uintatherium 



Orohippus 

 Bathyopsis 



1J5 f Knight 

 le-2 < Fowkes 

 ^ « ( Almy 



Break 



Lambdotherium 

 Coryphodon-Eohippus 



Fort Union J ^rejon 

 1 Puerco 



Pantolambda 

 Polymastodon 



Sarmatian-Pontian 

 Helvetian-Tortonian 



Burgidalian 



Aquitanian 

 Stampian (Tongrian) 



Sannoisian (Ligurian) 



Ludian 

 Bartonian 



Lutetian 



Ypresian (Londinian) 



Sparnacian 



Thanetian 



