THE EOCENE OF EUROPE AND NORTH AMERICA 



121 



Types of Eohippus Index 



" " " yassaciensis 



" " Phenscodus primae\^us 

 " " Coryphodon radians 

 » " " semicinctus 



" " ft latJceps 



Volcanic ash or 

 white beds 



Plants characteristic 

 of Denver fbrmatiort 



Plants and 



invertebrates 



of Montana 



age 



' the U.^5. Geological Survey 



Fig. 36. — Scale section of the Lower and Middle Eocene of southwestern Wyoming, showing 

 the relations of the "typical Wasatch group" of Hayden (.4); Modified from Veatch, 1907. 



