UNIVERSITY OF CALIFORNIA PUBLICATIONS 



BULLETIN OF THE DEPARTMENT OF 



GEOLOGY 



Vol. 10, No. 26, pp. 523-530, 5 text-figures April 20, 1918 



NEW MAMMALIA FROM THE IDAHO 

 FORMATION 1 



BY 



JOHN C. MERE I AM 



CONTENTS 



PAGE 



Introduction 523 



Ischyrosmilus? idahoensis, n. sp 524 



Neotragocerus lindgreni, n. sp - 526 



Equus idahoensis, n. sp - 527 



INTRODUCTION 



In attempting to work out a correlation scheme of the Cenozoic 

 formations in the Great Basin region, the writer has found the Idaho 

 formation particularly difficult to interpret with regard to its strati- 

 graphic relations and to its fauna. In the summer of 1916 the prin- 

 cipal exposures in southwestern Idaho were visited in company with 

 Dr. J. P. Buwalda in the interests of the United States Geological 

 Survey. In the course of this investigation a number of significant 

 collections of mammalian remains were obtained. In the material 

 secured there are a few new forms to which it is necessary to make 

 reference in several papers discussing phases of the Idaho problem. 

 A full discussion of the Idaho fauna with particular reference to its 

 affinities will be presented in a later paper. 



i Published by permission of the Director of the United States Geological 

 Survey. 



