168 



University of California Publications in Geology 



[Vol. 9 



COMPOSITION OF CEDAR MOUNTAIN VERTEBRATE FAUNA 



Pisces 



Salmon-like form 



Cyprinoid form 

 Testudinata 



Possibly Clemmys 

 Aves 



Nettion carolinense (Gmelin) 



Marila collaris (Donovan) 



Querquedula cyanoptera (Vieillot)? 

 Carnivora 



Tephroeyon, near kelloggi Merriam 



Canid, or nmstelid, small 



Canid, near Aelurodon or Tephroeyon 



Felid, large, probably machaerodont 



Felid, small, near Lynx 



Bassariscus nevadensis, n. sp. 

 Eodentia 



Dipoides, n. sp. 



Mylagaulus, sp. 



Aplodontia?, n. sp. 



Lepus, near vetus Kellogg 



Equidae 



Hypohippus (Drymohippus) nevaden- 

 sis Merriam 



Hypohippus, near osborni Gidley 



Meryehippus, sp. 



Protohippus?, sp. 

 Rhinocerotidae 



Aphelops?, sp. A 



Aphelops?, sp. B 

 Proboscidea 



Tetrabelodon, sp. 

 Camelidae 



Procamelus, near gracilis Leidy 



Pliauchenia ?, sp. 

 Merycodontidae 



Merycodus furcatus (Leidy) 



Merycodus, near necatus Leidy 



RELATION OF THE FAUNA TO ITS ENVIRONMENT 



A considerable part of the Cedar Mountain fauna comprises types 

 which might inhabit a region of arid or semi-arid climate not greatly 

 different from that of the Cedar Mountain area at the present day. 

 This might be true of the canids, the rabbits, some of the horses, the 

 camels, the merycodonts, and possibly the felids. Other forms, as 

 Bassariscus, Aplodontia, and Hypohippus, are types that would natur- 

 ally frequent a moist region or one well provided with trees or brush. 



The remains of fish and of fresh-water shells obtained at certain 

 localities in the Miocene of the Cedar Mountain region indicate the 

 presence of fresh-water bodies probably of considerable size. Fossil 

 wood representing trees of large size is common at a number of 

 localities. 



From consideration of all biological evidence available it appears 

 that the environment in the Cedar Mountain region during the deposi- 

 tion of the mammal-bearing beds must have been noticeably different 

 from that obtaining there at the present time. The presence of 

 considerable bodies of fresh-water, the presence of abundant forest 



