1917] 



Merriam: Pliocene Mammalian Faunas 



437 



Alticamelus, sp. div. 

 ?Proeamelus, sp. div. 

 Antelopes and deer 



Dromomeryx whitfordi Sinclair 

 Drepanomeryx falciformis Sinclair 

 Cervus, sp. 



Blastomeryx elegans Matthew and Cook 

 Blastomeryx, cf. wellsi Matthew 

 Merycodus necatus sabulonis Matthew and Cook 

 Merycodus, cf. necatus Leidy 

 Merycodus, sp. div. 

 Bovids 



Neotragocerus improvisus Matthew and Cook 



Bovid, gen. indet. 



Bison, sp. 

 Mastodons 



Gomphotherium, sp. 



?Mastodon, sp. 

 Birds 



» Aquila dananus? Marsh 

 ^ Buteo, near borealis (Gmelin) 

 Keptiles 



Crocodile vertebra 

 Lizard jaws 

 Huge land tortoise 

 Of uncertain position 



Part of large mammal jaw 



The Snake Creek fauna is characterized by the presence of ad- 

 vanced types of Pliohippus, Neohipparion, antelopes of the Trago- 

 cerus type, Aelurodon, and a rare edentate. From Snake Creek are 

 also obtained less advanced forms as Protohippus, Mcrycliippus, Aplic- 

 lops, Dromomeryx, Blastomeryx, Merycodus. two or more oreodonts, 

 and Tephrocyon. The stage of the most progressive horses approaches 

 that of the Blanco forms, while abundant material represents Mery- 

 chippus types nearly identical with those of the Upper Miocene. 



The faun cl elS cl whole seems older than the Blanco. If it should 

 ever appear to be divisible into several horizons, one stage may be 

 found near that of the Thousand Creek and somewhat older than 

 Blanco. Another stage might be near the boundary line between 

 Miocene and Pliocene. 



The Republican River fauna of northwestern Kansas, which is 

 often tentatively referred to the lowest Pliocene, is an important as- 

 semblage of forms evidently older than the Snake Creek and contain- 

 ing a number of rather characteristic Miocene types. The faunal list 

 is as follows : 18 



is Adapted from Osborn, H. F., and Matthew, W. D., IT. S. Geol. Surv. Bull. 

 361, pp. 115-118, 1909. 



