CORRELATION A Nil) iWLEOGEOGRAril V 



241 



Attention may be called at this point to the practice of distinguishing 

 between t3'pical series like the Bridger, Wind Eiver, and Wasatch (see 

 Veatch, 1907),'- and (X)rrelated series, whi(;b may be distinguished by 

 quotation marks as "Bridger," "Wind River," "Wasatch," etcetera. 

 Life zonal names are applicable throughout. 



The lithological or geological characters in this ancient fluviatile, 

 flood-plain, and partly lacustrine country are limited in uniformity. 

 Correlation by geologic characters would be absolutely impossible. 

 There are some cases, however, where geologic similarity helps us; for 



— q EohcLsileus 



zone 



Dolichorhinus 

 Amynodon 



Achaenodon 

 Eobasl/eus 



\ Uinixtthe- 



Manteoceras 

 Mesatirhinus 



rzvmz 



zone Uin ta therlum 



Figure 6. — J/«(/r//e o»rf Upper Eocene Section — Washakie Series of southern Wyoming 



Upper : EobasHens Zono 

 Lower : IJintatheriuin Zone 



example, see table, page 236. Granger observes in the Lower Eocene that 

 the Lost Cabin, Lysite, and Knight formations are very similar litholog- 

 ically, although widely distributed geographically. 



Substantial success has attended this effort of the American Museum 

 parties to work downward from the typical Wind River into the Wa- 

 satch, so that we have now a complete faunal nexus from the top of the 



12 A. C. Veatch : Oeograpliy and (ioolosy of a I'ortion of Southwestern Wyoming, with 

 Special Reference to Coal and Oil. U. S. Geological Survey. I'rofessional Paper No. 56, 

 1907. 



