SANTA CLARA VALLEY : TOKREY-EUREKA-TAPO FIELDS. 83 
correct structure there is a duplication of beds in the cross section 
referred to. At the mouth of Eureka Canyon there is an exposure 
of Fernando conglomerate and sandstone, bearing fossils identifying 
them with the beds of Packard Hill, near Santa Barbara. Their dip is 
vertical, the change from the southerly dip of the older strata imme¬ 
diately south being somewhat abrupt. This is probably due to uncon¬ 
formity rather than to a structural break. The Eureka-Tapo anti¬ 
cline appears to be coextensive with the Torrey, a mile to the south. 
Neither has been traced from one end to the other, as delineated on 
the map (PI. I), but by reason of the alignment of several folds 
observed independently it is thought that all are parts of a single 
crumple. As in the case of the Torrey anticline, productive territory 
has been developed in proximity to the axis of the Eureka-Tapo fold, 
the western field being that near the mouth of Eureka Canyon, the 
eastern including several branches of Tapo Canyon. 
Between the two anticlines thus described is a syncline which has 
not been traced through from west to east, but which is supposed to 
be continuous, as represented on the map. It may be seen on both 
sides of Torrey Canyon, but in the eastern wall of Smith Canyon the 
fold, which is so pronounced to the west, is considerably obscured, 
perhaps by faulting along its axis. A sharp disturbance of the strata 
is recognizable in a vertical cliff of shale and sandstone directly across 
Smith Canyon from the easterly grade to the Torrey wells. In the 
line of the syncline, also, there is a similar flexure near the summit of 
Oak Ridge, and this in turn is in line with the Tapo syncline, a flexure 
a few hundred yards south of the main anticline in Tapo Canyon. 
There are other folds of minor importance in this region, here and 
there, sharp or even developed into faults of small extent. The larger 
folds that have been described converge near the mouth of Chaffee 
Canyon as they approach the Chaffee syncline. 
The formation chiefly involved in the flexures of the Torrey-Eureka 
region is that of Vaqueros age. To the south in the higher portion of 
Oak Ridge the siliceous shale of Modelo type is also involved in a 
minor degree. On the southern slope of the main ridge, near the 
Torrey road, the general dip, aside from numerous minor crumples, is 
northward, and a short distance north of the outcrop of the Fernando 
formation a sandstone suggesting one of the Vaqueros beds occurs in 
a position not at all out of harmony with the general structure. The 
actual correlation of this bed, however, remains undetermined and it 
has not been indicated on the map. North of the Vaqueros area, at 
the foot of Oak Ridge, is the Fernando, which also is involved in the 
general folding that has-taken place. 
It is possible that faults occur within the area of the folds referred 
to in the foregoing paragraphs. The greatest disturbance appears to 
have been in the line of the syncline separating the Torrey and 
