72 



TITA.NOTHERES OP ANCIENT WYOMING, DAKOTA, AND NEBRASKA 



Green River forests. — Our present knowledge of the 

 Green River flora, which, according to Berry (1914.1, 

 p. 164) was mid-Eocene, indicates a considerably 

 warmer climate than that of the basal Eocene Fort 



forests differed from the tropical forests of the Georgia 

 coast in the presence of genera Hke Bex, Juglans, 

 Myrica, Planera, Quercus, Rhus, Salix, and Zizyphus, 

 most of which are temperate types. Thus the Green 



MESOZOIC and PALEOZOIC 



Pe/ycoc/us 



Sh osh on fas 

 /^bsaroh/L/S 

 ' Didyrnic^iS 

 \//verr3\/us 



Miacis 

 Vu/pavus 

 Pafripfe/is 

 Pro/i'mnocyon 

 S/nopa 

 Trif-emnoc/on 

 ^Hapa/odecfes 

 CynodonfomyS 

 Diacodon 

 Pariofops 

 D/de/pnodaS 

 ,Pa/seosinopa 

 {Esfhonyx 

 ' Paramys 

 Mysops 

 ? Palaeanodon 

 5/y/inodon 

 Phenacodus 

 Pcfoconus 

 Menisco^her/um 

 Pyopsodus 

 Coryphodon 

 Baihyops/s 

 Eoffranops 

 Lambdoiher/um 

 Hyrachyus 

 Hep^odon 

 fiobippus 

 [O'Scodex/s 



Pe/ycodus 



Omomys 



Te fortius 



Abs3ro/<ius 



Didymicii's 



Vulpa vus 



Oxyasna 



S/nopa 



Hapa/odecfes 



Cynodon fomys 



En'fomo/esfes 



■acodon 

 Esfhonyx 

 Paramys 

 PPa/asanodon 

 Phenacodus 

 Pyopsodus 

 Coryphodon 

 Pephodon 

 Eobippus 

 Wasdi-chia 

 Diacodexis 



Figure 48. — Section through the Wind River formation (lower Eocene) near Lost Cabin, Wind River Basin 



Wyo. (No. 5, fig. 35) 



A complete list or genera from each horizon is given in the right-hand column. First appearance of the primitive titanotheres Lamidotherium 

 and Eotitanops. Chiefly after Granger (1910.1) and Sinclair and Granger (1911.1). 



Union, for it includes such types as Acrostichum and 

 Arunio, which are also represented in the contempo- 

 raneous Eocene flora of Georgia, as well as the genera 

 Ficus and Sapindus. The Green River lake-border 



River exhibits a commingling of warm-temperate and 

 tropical trees such as are now found in subtropical 

 forests in regions where there is a mean annual temper- 

 ature of about 14° C, uniform humidity, and an 



