NO. 8 MAMMALIAN FAUNA, BADVVATER AREA — GAZIN 



Helaletidae : 



Desmafotherimn zvoodi, new species 



Dilophodon, cf. Icotanus (Peterson) 

 Hyracodontidae : 



Epitriplopusf, sp. 

 Amynodontidae* : 



Amynodon advetius (Marsh) 

 Artiodactyla : 

 Dichobunidae : 



Pcntaccmylusf, sp. 



Apricitlus praeteritits, new genus and species 

 Agriochoeridae : 



Protorcodon, cf. pctcrsoni Gazin 



Protoreodon, near P. pmniius (Marsh) 



Protoreodon pcarcei, new species 



Diplobunops, cf. inatthewi Peterson 

 Oromerycidae : 



Malaquiferiis tourteloti Gazin 

 Leptomerycidae : 



Leptotraguliis, cf. mcdius Peterson 



Leptorcodonf, sp. 



* Rodents are as described by A. E. Wood from material in the collections at Amherst 

 College and not represented in collections at the U. S. National Museum. The Amynodon 

 material is that identified by H. E. Wood, II, in the collection of Wood, Seton and Hares. 



CORRELATION AND AGE OF THE FAUNA 



The fauna listed above is, of course, by present standards upper 

 Eocene in age. Moreover, there would seem to be no doubt but that 

 it is Uintan, Apparently not any of the forms here recognized are 

 characteristically or exclusively Duchesnean. The general association 

 of forms seen in the assemblage and the development reached in 

 certain groups such as the agriochoerids rather strongly suggest an 

 upper Uintan stage close to that at Myton pocket. 



Considering first the reasons for not regarding the fauna as 

 Duchesnean, only the rodent which A. E. Wood (1949) cited as 

 questionably Protadjidanmo might be interpreted as this age. Never- 

 theless, this form is also older than Lapoint in age, as Kay (1953, 

 p. 24) cites it as occurring in the Randlett fauna, and the latter I re- 

 gard as but scarcely di.stinct from that of Myton, including it ^ (Gazin, 

 1955, chart I ) in the Uintan. The remainder of the fauna is composed 

 of genera that so far as Duchesnean is concerned are characteristically 

 earlier or common to both Uintan and Duchesnean. Thus, besides 



2 As currently being proposed by the Committee on Nomenclature and Cor- 

 relation of North American Continental Tertiary of the Society of Vertebrate 

 Paleontology. 



