UNIVERSITY OF CALIFORNIA PUBLICATIONS 



BULLETIN OF THE DEPARTMENT OF 



GEOLOGY 



Vol. 8, No. 14, pp. 289-298, 1 text-figure Issued December 10, 1914 



THE MARTINEZ EOCENE AND ASSOCIATED 

 FORMATIONS AT ROCK CREEK ON THE 

 WESTERN BORDER OF THE 

 MOHAVE DESERT AREA 



BY 



ROY E. DICKEESON 



CONTENTS 



PAGE 



Introduction and Acknowledgments 289 



General Statement of Stratigraphy and Structure 290 



Basement Complex 292 



Martinez Group 293 



Fauna of Martinez Group 295 



Miocene(?) Strata 295 



Andesitic Lava Flow 296 



Pleistocene( ?) Fanglomerate 297 



Conclusions as to Stratigrapic Sequence in the Rock Creek Area 298 



INTRODUCTION AND ACKNOWLEDGMENTS 



Correlation of the terrestrial and lacustrine Tertiary deposits 

 of the Great Basin Province with the marine Tertiary of the Coast 

 Ranges is one of the problems of west-coast geology now being 

 investigated by Professor J. C. Merriam. The results presented in 

 this paper are by-products incidental to this investigation. The work 

 was done under the direction of Professor Merriam, and the writer 

 wishes to thank him for the opportunity to contribute in a small way 

 to this work. Mr. Emerson Butterworth and Mr. Edward Brainerd 

 ably assisted the writer in mapping the field and in collecting speci- 

 mens. Dr. L. P. Noble of the United States Geological Survey, 



