UNIVERSITY OF CALIFORNIA 



Bulletin of the Department of Geology 



Vol. 2, No. °, pp. 269-314 ANDREW C. LAWSON, Editor 



A CONTRIBUTION 



TO THE 



GEOLOGY OF THE JOHN DAY BASIN 



BY 



John C. Merriam 

 CONTENTS. 



Page. 



Introduction 270 



Geographic Features 271 



History of Exploration 272 



Literature 275 



General Features of the Geology 278 



Pre-Cretaceous Formations 279 



Cretaceous, Chico and Knoxville 280 



Eocene, Clarno Formation 285 



John Day Series 291 



General Characters 291 



Classification on Basis of Lithologic and Stratigraphic Characters 293 



Palaeontologic Classification 295 



Extent and Stratigraphic Relations 297 



Mode of Deposition 299 



Fossil Remains 302 



Columbia Lava 303 



Mascall Formation 305 



Nomenclature 305 



Occurrence and Stratigraphic Relations , 306 



Fossil Remains 307 



Origin 309 



Rattlesnake Formation 310 



Stratigraphy 310 



Fossils 311 



Basin of Deposition 311 



Deformation 311 



Age of the Rattlesnake 312 



