SCII-XTIFIC BACKC.ROUND 151 



Ana Rivers flow seaward across the Downey Plain to 

 the coast through synclinal gaps in the Santa Monica, 

 Repetto and Puente Mountain Ranges and also in the 

 Dominguez Range. The Los Angeles River leaves 

 the San Gabriel Valley through a synclinal pass in 

 the city limits formed by the opposing ends of the 

 Elysian Park and Repetto Hills. The San Gabriel 

 River likewise leaves the San Gabriel Valley between 

 the plunging ends of the Puente and Montebello folds. 

 The Santa Ana Pass is also a similar synclinal gap 

 in the mountains. The mouths of all these rivers 

 reach the sea through synclinal gaps of the Dominguez 

 Range. In other words, all of the streams pass through 

 the ranges which cross their paths through synclinal 

 gaps. 



Kew has shown upon the portion of his map north 

 of Soledad Canyon many small parallel faults of north- 

 east direction which bend eastward, and also a con- 

 spicuous one which extends southwest from Lang to 

 German Canyon. Some inferior northeast faults also 

 cross the Santa Monica Mountains. 



Other northeast faults of considerable lengths are 

 shown on Kew's map along the lower portions of the 

 Big and Little Tujunga Canyons and near the west 

 side of the San Fernando Valley. Suggestions of 

 faults of this trend are seen mostly east of the latter 

 locality along the south side of the San Gabriel Range, 

 as far east as Lytle Creek Canyon. 



A peculiarity of the northeast-trending faults is 

 that they often occur as short parallel segments be- 

 tween major faults of opposite directions, like the 

 rounds of a ladder between its side rails. It appears as 

 if they had been cut across by transecting faults of the 



