UNIVERSITY OF CALIFORNIA PUBLICATIONS 



BULLETIN OF THE DEPARTMENT OF 



GEOLOGY 



Vol. 5, No. 1 1, pp. 171-205 ANDREW C. LAWSON, Editor 



TERTIARY FAUNAS OF THE 

 JOHN DAY REGION. 



- BY 



John C. Merriam and William J. Sinclair. 



CONTENTS. 



PAGE 



Introduction 171 



Btratigraphic succession of the Cenozoic formations in the John Day 



Basin 172 



History of correlation : 176 



The John Day 183 



Palaeontological classification 183 



The total fauna 184 



The fauna of the lower division 187 



The fauna of the middle division : 188 



The fauna of the upper division 190 



Age 193 



The Mascall 195 



Fauna 195 



Age 197 



The Eattlesnake 198 



List of contributions to the geology and palaeontology of the John Day 

 region 199 



INTRODUCTION. 



In several publications appearing - at intervals since 1901 

 there have been presented the principal geological and palaeon- 

 tological results obtained by the University of California ex- 

 peditions in the John Day region of Oregon. A general state- 

 ment of the results so far as correlation and faunal relations are 

 concerned has, however, been deferred until all of the available 

 evidence should be obtained from the several fields of investiga- 

 tion in which work has been in progress. The following contribu- 

 tion is based primarily on the collections made by parties from 



