CONTENTS. 
Page. 
Preface. X] 
The Santa Clara Valley Oil District, Southern California, by 
George H. Eldridge. 
Introduction. 1 
Acknowledgments. 1 
Topography. 1 
Geologic formations. 4 
General statement.. 4 
Granitic basement. 5 
General character and distribution. 5 
Topatopa formation. 5 
General character. 5 
Distribution. 7 
Age. 7 
Occurrence of oil. 7 
Sespe formation. 7 
General character. 7 
Lower zone. 8 
Red beds. 8 
General description. 8 
In the Ojai Valley. 9 
South of the Santa Clara... 10 
Oil in the red beds. 10 
Upper zone. 10 
Relation of upper Sespe beds to Vaqueros shale. 11 
Oil in the upper Sespe beds. 12 
Vaqueros formation. 12 
Age and general character... 12 
In the Ojai Valley. 13 
South of the Santa Clara. 15 
Modelo formation. 17 
General character. 17 
Lower sandstone. 18 
Upper sandstone. 18 
Shale in the Modelo. 19 
Variation in composition of the Modelo. 19 
Supposed Modelo beds in the Ojai Valley and Sulphur Mountain. 20 
Correlation of the upper shaly portion of the Modelo with the Monterey 
shale. 20 
Difficulties of correlation between north and south sides of Santa Clara 
Valley. 21 
Burning of the shale. 22 
in 
