172 University of California Publications in Geology [Vol. 9 



similarity in the presence of Tephrocyon, a Bassariscus-like form, 

 Dipoides, Mylagaulus. rhinoceroses, merycodonts, advanced camels, 

 Hypohippus of an advanced stage, and Merychippus. The presence 

 of numerous advanced horses of the Neohipparion, Protohippus, and 

 Pliohippiis types, with the introduction of true antelopes in Neotra- 

 gocerus, indicates that the Snake Creek is younger than the Cedar 

 Mountain, but the difference is evidently not measured by the lapse 

 of more than half of a geological period. 



On the whole there seems good reason for considering the Cedar 

 Mountain fauna as near the Barstow and the Santa Fe in stage, and 

 somewhat older than the Republican River and Snake Creek. 



DESCRIPTION OF THE FAUNA 

 Pisces 



A considerable number of fragmentary fish remains consisting 

 of isolated vertebrate and parts of head bones were found at several 

 localities. They include at least two forms, one near the salmon and 

 the other too imperfect for determination. Professor J. O. Snyder 

 of Stanford University, who examined the collection of fish remains 

 from the Cedar Mountain beds writes concerning them as follows : 



"I am returning the fossil fish remains today and I am unable to say 

 anything further about them than that they appear to belong to some salmon- 

 like form and are certainly not members of other families now living in the 

 Great Basin. There may be more than one species represented. Dr. Jordan 

 and others here could offer nothing more in way of suggestion. ' ' 



Testudinata 



A few fragments of plates found in the deposits at locality 2027 

 in association with fish remains and with fresh-water gastropods may 

 represent a type near Clemmys. The material is too imperfect 'for 

 satisfactory identification. The form represented by the material 

 may be a fresh-water type. No remains of land tortoises such as appear 

 in the Barstow and Ricardo faunas are as yet certainly known from the 

 Cedar Mountain beds. 



Aves 



A few fragmentary bird remains obtained in the Cedar Mountain 

 region by Baker and Buwalda are interesting as representing some 

 of the very few avian remains known from the West-American middle 

 Tertiary. 



