CORRELATION AND PALEOGEOGRAPHY 



285 



_,=^Jl^^_[?!U..zz-.^_ J r> -I J Types of Eohippus index 



V- -J^ — - _ =1 zone yassac/ensiS 



>' " Phenacodus pn'maei^us 

 _ // // Coryphodon radians 



Hr^ Red a n^'y e 1 1 owlaTid yl^ // // // Semicmctus 



^^-^^^-^'^^^^^^-^^ red beds » // // /ai/ceps 



Vo/canic ash or 

 white beds 



Piants characteristic 

 ofDemyer formation 



PI ants, and 



in vertebra tes 



of Montana 



age 



.J 



Figure 2. — Composite Section, Cretaceous to Lower Eocene Series 

 Typical Wasatch of southwestern Wyoming 



Upper : Orohippus and Uintatheriuni Zone, Brldger 

 Middle : Coryphodon Zone, or Knight formation 

 XVII— Bull. Geol. Soc. Am., Vol. 23, 1911 



