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IJ niversitjj of California Puhlicatiois in Geology [Vol.12 



Fernando has been faulted down against the Salinas shale and 

 folded into a syneline and anticline. These folds are closely com- 

 pressed in Redrock Canon, but flatten out to the west so that the dip 

 of the beds is not over twenty degrees. East of Redrock Caiion com- 

 plexly contorted and faulted strata prevail. The Monterey group 

 extending east from the Loma Alta area is usually overturned and 

 complicated by numerous small faults. The Redrock fault east of 

 Loma Alta ends at a cross fault, which occurs just west of the big 

 hend in the Santa Ynez River. East of this bend the strata show more 

 definite structure ; also a more continuous section from the Sespe 

 through a greater part of the IMonterey is exposed. Two folds, a 

 syneline and an anticline which pitch to the west may be traced as 

 far east as the Cold Spring trail. 



The Santa Ynez fault which forms the southern limit for this area 

 is of especial interest in that it represents one of the latest periods of 

 disturbance in this region. This fault traverses the entire width of 

 the Santa Ynez district in a direction slightly south of east and is 

 approximately parallel witli the axis of the Santa Ynez Range. It 

 separates tlie Eocene strata forming the major part of the mountains 

 from the Pliocene and Pliocene rocks on the north. Evidence as to 

 the dip of the fault plane is not usually available, but, wherever seen, 

 the dip is approximately vertical. The fault trace is marked by 

 .straight canons and saddles in ridges. This is strikingly shown in 

 Blue Canon and on the divide at the head of its west branch. The fault 

 is by far the largest in the district and probably extends farther to the 

 east up Blue Caiion, thougli it has not been followed beyond the limits 

 of this district. 



Santa Ynez I\Iountans Area 

 The Santa Ynez iMountains are characterized by two sets of fold- 

 ing which probably occurred at different periods. The earlier set is 

 represented by the northwesterly striking folds immediately east of 

 San ]Marcos Pass. The largest of these is a syneline whose axis follows 

 closely the trend of Paradise Canon. Infolded with the Tejon rocks 

 is about 1700 feet of the Sespe formation. To the west of this fold 

 an anticline and syneline parallel this fold on the west. They are 

 considerably shallower, so that the Sespe formation has been eroded 

 from the syneline. All these folds are cut off obliquely at the north 

 by the Santa Ynez fault. 



