SCIENTIFIC BACKCJROUND 139 



probably the continuitj^ has been interfered with by 

 being crossed by later northwest faults passing ap- 

 proximately along the course of the Los Angeles River 

 and through the northeast side of Griffith Park. It 

 may also make an echelon jog to the north of Pasa- 

 dena and from there continue eastward along the 

 south foot of the San Gabriel Range, where the latter 

 borders upon the San Gabriel and Ontario Foothill 

 Valleys. This portion of its extent is indicated by the 

 steep topography of the adjacent highlands. Its fur- 

 ther direct course eastward is apparently discontin- 

 ued by being crossed out by the San Andreas rift at 

 Cajon Pass. If the fault crosses the San Bernardino 

 highland, its path is not definitely known, although 

 one which corresponds to it is shown on some of the 

 fault maps. To the east of the San Bernardino Plat- 

 eau the lineament continues to the Colorado River as 

 the Pinto Mountain fault — a remarkable and conspic- 

 uous feature, not hitherto named or described. 



OTHER FAULT LINES OF THE TRANSVERSE 

 BELT 



Several other great rift lines of the Transverse Belt 

 are known. Some lie to the north of, and parallel to, 

 the Anacapa master rift above indicated. Among these 

 may be mentioned the Santa Ynez, the Santa Barbara 

 and Bouquet Canyon faults. Of this group of faults 

 the Santa Ynez is the most conspicuous, as its line 

 is one along which there has been considerable 

 activity of late, as at Santa Barbara and near Lompoc. 



A few other faults parallel this line to the south. 

 Among these are the Banning and Lawrence faults of 

 the San Gorgonio pass and Riverside regions, the latter 

 of which is herein noted and named for the first time. 



