THE EOCENE OF EUROPE AND NORTH AMERICA 



123 



were composed are partly indicated in the petrographic analysis of Johann- 

 sen.' 



;^3^3iN0NF0SSI LI FERGUS 



LarnhdotheTium 



Paramys 



Coryphodon (rare) _ 



Lambdotherium primae^^um 



Phenacodus 



Eohippus cristatus 



Heptodon 



CoTyphodoTL zone 

 Pelycodus 

 Oxyaena 

 Anacodon 



Eohippus (very abundant) 

 Systemodon 



Coryphodon (very abundant) 

 Sinopa 

 Trigono/estes 

 Hyopsodus 

 Sarcolemur 

 Est h onyx 

 Palaeictops 

 Paramys 



Fig. 38. — Composite columnar section of the Wasatch and Wind River formations of Big 

 Horn basin, compiled from sections by F. B. Loomis. See section A, Fig. 35. Total thickness 

 2,391 feet. 



Wyoming in Wasatch times. — A glance at Fig. 35 enables us to restore 

 two of these great basins, the Wasatch lying south of parallel 42° 



' Johannsen, Albert, Petrographic Report on Rocks Collected by Professor H. F. Osborn, 

 U.S. Geol. Surv. In Ms. 



