Bulletin No. 309 
I B, Descriptive Geology, 112 
DEPARTMENT OF THE INTERIOR 
UNITED STATES GEOLOGICAL SURVEY 
CHAJRLES D. WALCOTT, DIRECTOR 
THE 
SANTA CLARA VALLEY, PUENTE HILLS 
AND LOS ANGELES OIL DISTRICTS 
SOUTHERN CALIFORNIA 
GEORGE HOMANS ELDRIDGE 
AND 
RALPH ARNOLD 
PL 
WASHINGTON 
GOVERNMENT PRINTING OFFICE 
1907 
