FOSSIL HORSE REMAINS FROM IDAHO — GAZIN 287 



according to Lugn and Schultz.^^ Moreover, several of the forms 

 present as Hyaenognathus or Borophagus, Lutravus?, Plesippus, 

 mastodont, Mimomys, and the rabbits show Pliocene affinities, many 

 of the remaining genera as recognized being less restricted in time. 

 The presence of a true cervid is not necessarily indicative of Quater- 

 nary age, as fragmentary remains have also been reported from the 

 upper Etchegoin and Eden beds in California. Megalonyx, though 

 well known in the Pleistocene, has been found in several Pliocene 

 deposits. 



On the basis of the vertebrate remains the Hagerman horizon 

 appears not far removed from the Blanco stage in Texas. The 

 differences between the faunas from two localities may be only of 

 geographic significance. The Blanco shows a greater wealth of 

 Proboscidea but fewer members of the microfauna. A comparative 

 list of the known Mammalia in the two faunas is given on the next 

 page. 



i» Lugn, A. L., and Schultz, C. B., Nebraska State Mus. BuU. 41, vol. 1, pp. 319-393, 1934. 



