UNIVERSITY OF CALIFORNIA PUBLICATIONS 



BULLETIN OF THE DEPARTMENT OF 



GEOLOGY 



Vol. 6, No. 3, pp. 55-78, Pis. 13-18 Issued February 18, 191 1 



THE GEOLOGY OF THE SARGENT OIL 



FIELD 



BY 



WILLIAM F. JONES. 



CONTENTS. 



PAGE 



Introduction 56 



Physiographic Features 56 



Summary Statement of the Geology 57 



Pre-Franciscan Rocks 58 



Sedimentary 58 



Igneous 59 



Franciscan Series 60 



Serpentine 61 



Miocene Series 62 



Lower Miocene 62 



Monterey Shale , 63 



San Pablo Formation 65 



Member A 65 



Members B and C 67 



Member D 67 



Member E 68 



General Features of the San Pablo Formation 68 



Santa Margarita Formation 69 



Merced and Purisima Formations 70 



Fresh Water Formation 71 



Pleistocene and Recent Formations 72 



Geologic History , 73 



Pre-Franciscan 73 



Franciscan Time 73 



Post-Franciscan and Pre-Tertiary 73 



Tertiary. Pre-Miocene 73 



Miocene 73 



San Pablo Time 74 



Merced and Later 74 



