UNIVERSITY OF CALIFORNIA PUBLICATIONS 



BULLETIN OF THE DEPARTMENT OF 



GEOLOGY 



Vol. 6, No. 8, pp. 171-177 Issued June 28, 191 1 



THE STRATIGRAPHIC AND FAUNAL RELA- 

 TIONS OF THE MARTINEZ FORMATION 

 TO THE CHICO AND TEJON NORTH 

 OF MOUNT DIABLO 



BY 



ROY E. DICKEESON. 



CONTENTS. page 

 Introduction 171 



Nature of Chieo, Martinez, and Tejon Formations in the Area Con- 

 sidered 172 



Relation of Martinez to Tejon 174 



Relation of Martinez to Chico 176 



INTRODUCTION. 



The Martinez formation was first described by Gabb 1 from 

 beds supposed to be transitional between the Chieo and Tejon 

 groups. It was shown later by Stanton- to contain a fauna dis- 

 tinct from that of the Chieo, but was referred by Stanton to the 

 Tejon as a division of that group. In a study of the type 

 locality for the Martinez group Merriam 3 came to the conclusion 



1 Gabb, W. M., Rep. Geol. Surv. of Cal., Palaeontology, vol. II, p. 13, op. 

 preface, 1869. 



2 Stanton, T. W., The Faunal Relations of the Eocene ami Upper Creta- 

 ceous on the Pacific Coast, 17th Rep. U. S. Geol. Surv., pp. 1011-1060, 

 1895-96. 



3 Merriam, ,1. C, The Geologic Relations of the Martinez Group of Cali- 

 fornia at the Typical Locality, Jour, of Geol., vol. 5, pp. 767-775, 1S97. 



