PROCEEDINGS 



OF THE 



CALIFORNIA ACADEMY OF SCIENCES 



Fourth Series 



Vol. VII, No. 9, pp. 207-227, pis. 32 and 33. July 31, 1917 



IX 



GEOLOGY OF A PORTION OF THE McKITTRICK 



DISTRICT, A TYPICAL EXAMPLE OF THE WEST 



SIDE SAN JOAQUIN VALLEY OIL FIELDS, 



AND A CORRELATION OF THE OIL 



SANDS OF THE WEST SIDE FIELDS* 



BY G. C. GESTER 



CONTENTS PAGE 



Introduction 208 



Acknowledgments 208 



Upper Miocene and Pliocene Deposits of the West Side Fields 209 



Location 209 



Topography 209 



Geologic formations 210 



General Statements 210 



Superticial deposits 211 



Tulare (Pliocene) formation 212 



Structure ., 213 



Relation to Petroleum 215 



Etchegoin (Lower Pliocene) formation 216 



Structure 218 



Relation to Petroleum 218 



Shale Series (Santa Margarita-Monterey) 219 



Relation to Petroleum 219 



Age and Stratigraphy of the Oil Horizons 220 



Lost Hills 221 



Belridge 223 



McKittrick 224 



* Printed from the John W. Ilendrie Publication Endowment. 



July 31. 1917 



