1917] 



Merriam: Pliocene Mammalian Faunas 



439 



beds of Florida. The study of the fauna has been difficult because of 

 mixture with remains from other formations. The recent work of 

 Dr. E. H. Sellards 18 has made possible segregation of the Pliocene 

 elements. The list is as follows : 



Alachua Fauna 

 Alachua Clays and Bone Valley 



Teleoceras fossiger var. proterus 



(Leidy) 

 Aphelops nialacorhinus Cope 

 ?Mammut progenium Hay 

 Mastodon (Trilophodon) floridamis 



Leidy 



Hipparion ingenuuni (Leidy) 

 Hipparion plieatile Leidy 

 Hipparion minor Sellards 

 Procamelus major (Leidy) 

 Procamelus medius (Leidy) 



Procamelus minor (Leidy) 



Tomistoma amerieana Sellards 



Alligator 



Cetacean 



Fishes 



Odocoileus 



Megatherium, sp. 



Agriotherium schneideri Sellards 



Emys 



Crocodile or alligator 

 Garfish 



Duunellon Formation 

 Aphelops nialacorhinus Cope ?Megalonyx, sp. 



Mastodon (Trilophodon) floridanus 



Leidy 

 Hipparion, sp. div. 

 Parahippus, sp. 



TJrsus, sp. 

 Felis, sp. 

 Odocoileus, sp. 

 Procamelus minor (Leidy) 



Newberry, Alachua County, Possibly Pleistocene 

 Equus littoralis Hay Tapirus terrestris (Linn.) 



Odocoileus, sp. 



TIME RELATIONS OP AMERICAN FAUNAS 



Comparison of Pacific Coast and Great Basin Pliocene faunas shows 

 that of the four stages in the Pacific Coast province the uppermost, 

 the Tulare or Hyaenognathus zone, is evidently nearest the Idaho or 

 Equus-Cervus 1 zone of the Great Basin. As yet these two faunas are 

 too imperfectly known to permit satisfactory comparison. 



The second or Pliohippus proversus zone of the Pacific Coast upper 

 Etchegoin is a less advanced stage than the Idaho, but the fauna is 

 quite different from that of the Thousand Creek-Rattlesnake stage, 

 and is more advanced. This zone is not as yet known in the Great- 

 Basin province. 



The Pliohippus coalingensis zone of the Pacific Coast region con- 



18 Sellards, E. H., Fossil vertebrates from Florida: A new Miocene fauna; 

 New Pliocene species; The Pleistocene fauna, 8th Ann. Rep. Florida Geol. Surv., 

 pp. 79-119, pis. 10-14, 1916. 



