3 
letin No. 309 
« - AO f A, Economic Geology, 91 
senes | ^ Descriptive Geology, 112 
DEPARTMENT OF THE INTERIOR 
UNITED STATES GEOLOGICAL SURVEY 
CHARLES D. WALCOTT, Director 
THE 
NT A CLARA VALLEY, PUENTE HILLS 
AND LOS ANGELES OIL DISTRICTS 
SOUTHERN CALIFORNIA 
Vv' by 
GEORGE HOMANS ELDRIDGE 
AND 
RALPH ARNOLD 
WASHINGTON 
GOVERNMENT PRINTING OFFICE 
1907 
