SCIENTIFIC BACKGROUND 



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SAN GABRIEL SCARP NORTHEAST OF PASADENA 

 Shuwiny; rifts and kernbuts 



through a point just north of Saugus to near Sulphur 

 Peak, in the Ventura Ranges. From this point the 

 course is uncertain. It may curve westerly along the 

 south sides of the more or less continuous Topa-Topa 

 and Santa Ynez Range, or continue northerly through 

 the Castiac Valley, as has been suggested to me by 

 Mr. Hoyt E. Gale. 



The Sierra Madre fault follows the edge of the San 

 Gabriel Highland and practically parallels a portion 

 of the San Gabriel Fault. It may be related to a fault 

 line which follows the South Oak Ridge and Santa 

 Susana Mountains of the flexured Ventura Ranges. I 

 refer to Kew's descriptions^ for facts and details. 

 THE VERDUGO FAULTS 



A large fault or fault zone follows the south side of 

 the Verdugo Mountain block, north of the towns of 



'Bull 753, U. S. Geological Survey. 



