256 



HENRY F. OSBORN 



Cernaysian) stage of northwestern Europe. It is all Paleocene, or 

 Basal Eocene, 



Lower. — The beginning of the Lower Eocene is clearly defined in 

 the Rocky Mountain region and with equal sharpness in northern 

 France and Belgium by the appearance of Coryphodon, and by the 



DipZacodon 



Diplacodon 



Artlodactyla and chief collection 

 of Uinta mammalsCsmall) 

 Dip lacodon 



f Dolichorhinus cornutus, 



chief fossiliferous leyel 



Amynodon 

 EohasileiJS 



zone Metarhinus 



- Chief fossiliferous level 

 /Metarhinus 



Fig. 3. — Columnar section of the Uinta formation, northern Utah. In A and B 

 the diagram does not properly represent the irregular nature of the so-called sand- 

 stones and clays, which are probably in part coarser and finer volcanic-dust deposits. 

 Modified from notes by O. A. Peterson, 1894. Faunistic studies by Osborn. 



opening of the second faunal phase with its advent of modernized life. 

 Our Lower and Upper Wasatch correspond respectively with the 

 Sparnacian and Ypresian stages of France. It is represented in deep 

 and fairly rich exposures in northern New Mexico and in western, 

 central, and northern Wyoming. 



