Vol. 6, No. 1 1, pp. 199-304, pis. 32-33 Issued September 16, 191 1 



UNIVERSITY OF CALIFORNIA PUBLICATIONS 



BULLETIN OF THE DEPARTMENT OF 



GEOLOGY 



TERTIARY MAMMAL BEDS 



OF 



VIRGIN VALLEY AND THOUSAND GREEK 



IN 



NORTHWESTERN NEVADA 



BY 



JOHN C. MERRIAM 



PART II.— VERTEBRATE FAUNAS 



CONTENTS 



PAGE 



Introduction 202 



Fauna of Virgin Valley Beds 204 



Occurrence and Composition 204 



Faunal Relationships 206 



Relation of Virgin Valley Fauna to its Environment 208 



Fauna of High Rock Canon and Little High Rock Canon 209 



Fauna of Thousand Creek Beds 210 



Occurrence and Composition 210 



Relation to Virgin Valley Fauna 214 



General Relationships of Thousand Creek Fauna 216 



Relation of Thousand Creek Fauna to its Environment 218 



General Correlation of Virgin Valley and Thousand Creek Beds on 

 Basis of Physical and Biological Relationships to other Forma- 

 tions of the Pacific Coast Region 220 



Relation of Virgin Valley and Thousand Creek Beds to each other.... 220 

 Relation of Virgin Valley Beds to the Middle Miocene Formations 



of the Pacific Coast and Basin Regions 224 



Relation of Virgin Valley Beds to Faulting Movements of Basin 



Region _ 227 



Relation of Thousand Creek Beds to other Formations of the Pacific 



Coast and Basin Regions 228 



