THE PUENTE HILLS OIL DISTRICT, SOUTHERN 
CALIFORNIA. 
By George Homans Eldridge. 
INTRODUCTION. 
In the following report it is proposed to describe briefly the geology 
and structure of the Puente Hills, especial attention being given to 
those features which appear to have a bearing on the occurrence of 
petroleum in the different fields of the district. The reader is referred 
to Mr. Arnold’s report on the Los Angeles district (pp^ 138-142) for 
information concerning the previous knowledge of the region and for 
a bibliography of publications relating to it. 
ACKNOWLEDGMENTS. 
Acknowledgments are due to the various oil companies and their 
managers in the different fields for assistance in various ways and for 
information given by them during the course of the work. Thanks 
are due more particularly to Mr. Fred T. Perris, manager of the Santa 
Fe Railway oil properties; to Mr. E. A. Bacon, of the Murphy Oil 
Company; to Messrs. Graham and Loftus, of the Graham-Loftus Oil 
Company; to Mr. R. N. Bulla, of the Central Oil Company, and to 
Mr. Dan Murphy, of the Brea Canyon Oil Company. Uniform cour¬ 
tesy has been shown by those in control of the different properties in 
this district, all, without an exception, furnishing any information 
requested. 
LOCATION AND TOPOGRAPHY. 
The Puente Hills, along the southern face of which has been devel¬ 
oped one of California’s most productive oil territories, are situated in 
the southwest corner of the State, beginning at a point about 12 
miles slightly south of east of Los Angeles and extending in a general 
east-southeasterly direction for 22 miles to Santa Ana River. They 
cover an area, roughly, of about 140 square miles. The western 
and northern parts of the hills lie in Los Angeles County; the south¬ 
eastern part is divided between San Bernardino County on the north 
and Orange County on the south. They are situated but 35 miles 
from San Pedro, the principal deep-water harbor of southern California, 
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