9 
OIL DISTRICTS OF SOUTHERN CALIFORNIA. 
excessively rugged and represent the convergence of several ranges, 
which to the northwest maintain a conspicuous individuality. Pine 
Mountain, which is 7,488 feet in altitude, is their culminating point. 
The area thus occupied forms a part of the Santa Barbara Forest 
Reserve, recently set aside by the United States Government. The 
greater portion of it is accessible only by trail and is almost wholly 
uninhabited. 
Fig. 1 . Index map of a portion of southern California, showing the location of the three districts 
described in this bulletin and of the other important producing districts of the State. 
The San Gabriel Range, in which rise the southerly heads of Santa 
Clara River, equals in ruggedness and general altitude the moun¬ 
tains to the north. This range, with its western extension, the 
Santa Susana Mountains, separates the Santa Clara Valley from 
those of Los Angeles, Tujunga, and San Gabriel rivers, while still 
farther west Oak Ridge and South Mountain, in extension of the 
