(NEB.) 



ZONES 



MAMMALS 



(c.nr/.s 



Or/ //OS 



M<'(/(i/niii/.\ 



lltliiiis 



Bison 



Cas (oroides 



Mastodon 



P/<itygonus 



I^lcfj/uis :' 



(i/i/i)f()f/irrii/m. Pliauchenio 

 ■'' Felis 



•J I'rrrirrrfi.s 



Neotrdgocerus 

 Epigdulus 



/•ro 



r</nii'iii.s 



f„ 



Teleoceras 

 Aelurodon 

 Neohipparion 

 \ Protoliippus 



Merycodus 

 ,,,.,, , Tri/ophodon 



Jirlinlrplus Aphelops 



Merychippus 



MerychyuS 

 Oxydactylus 

 Moropus 

 Parahippus 



^ :,T>/rorhorra^ Oxydactylus 

 Moropus 



Dircn/ihcriujn 



Eporeodon 

 I'rornrri/rnrhnjrus Steneofiber 



Entelodon 

 LepfuucheTiia Protoceras 



OrcoJon 



Po'ebrotiierium 

 Mitamynodon 

 Hyaenodon 

 Hgracodon 



Leptomeryx 

 TifdnofJirriunh PotyJopus, 



Mesohippus 

 Trigonias 



DiplarodoTt 



Eo1>asiffiis 



Epi/yippus 

 Dolichorhinus 

 Amynodon 

 Achaenodon 



I'inI at hrriiim. 

 Orohippus 



Palaeosyops 

 Notharctus 

 Patriofelis 

 Metacheiromys 



Systemodon 

 , , , . Pachyaena 



Lambdothfrmm. Phenacodus 

 Eohippus 



(NE^\'^[EXICo) Efififonops 

 Lnmbdothci 

 Cori/phodo// 



Pdnlolrimhdrt 



Euprotogonia 

 Chr incus 

 Pol ipnastodon. Periptychus 

 Dissacus 



DiuKi'iiin from l^rofcssor Oshorii's Atje of Mummnlx sliowiriK tho supposed tinu- sequence 

 and (■(iiiivalerice ot the principal fossil mammal l)eariuf; deposits oC the West. The " Zoni-s" 

 arc liiiKi di\isioiis iianicd from characteristic mammals fouinl in ilic siiccccssixc formations 



