CONTENTS. 
VII 
The Los Angeles Oil District, Southern California, by Ralph 
Arnold. 
Introduction.. 
Acknowledgments.. 
Previous knowledge of the region..•_. 
Location and topography. 
Geologic formations. 
General statement. 
Black schist. 
Granite.. 
Puente sandstone. 
General character... 
Fossils. 
Upper Puente shale. 
General character.. 
Oil sands. 
Miocene basalt. 
Fernando formation. 
General character. 
Fossils. 
Pleistocene. 
General character. 
Brea deposits. 
Structure. 
General features. 
Structure of the oil belt.'_ 
Joint cracks. 
Oil fields. 
Location. 
Development. 
Eastern field. 
Location. 
Topography. 
Geology.r. 
Geology of the wells... 
Structure. 
Development. 
Central field. 
Location. 
Topography. 
Geology. 
Geology of the wells. 
Structure.. 
Development.. 
Western field. 
Location. 
Topography. 
Geology. 
Geology of the wells. 
Baptist College area.... 
Vicinity of Western avenue and Temple road. 
Area one-fourth mile northwest of Temple road and Western 
avenue. 
Area south of Colegrove. 
Structure. 
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