SANTA CLARA VALLEY : TORREY-EUREKA El ELDS. 
87 
TORREY WELLS. 
The productive territory of the Torrey anticline, forming what is 
known as the Torrey held, embraces an area of about 1 square mile, 
the length being twice the breadth and lying with the strike of the 
rocks, which gradually bend from N. 65° W., the direction prevailing 
on the side of the flexure, to northwest, north northwest, and north as 
the strata round its end. The axis of the anticline passes close to the 
northern edge of the held, the wells, with a few exceptions, having 
been drilled in the strata of gentler dip, 30° to 40°, south of the axis. 
In all there are between 50 and 60 wells, aligned in seven or eight con¬ 
centric arcs, in accordance with the curves assumed by the outcrop¬ 
ping strata. The wells nearer the axis penetrate the red and gray 
banded argillaceous sandstone that has been correlated with a portion 
of the Sespe formation, while those more distant are perhaps entirely 
confined to the sandstone and shale of the Vaqueros. 
It is said to be usually impossible in this held to identify horizons 
in one well with those in another, even though the two locations are 
adjacent. The oil sands also vary in thickness from a few feet to 150, 
and even the thicker beds, it is reported, can not be identihed from 
well to well. It is, however, the opinion of the writer that consider¬ 
able order might be worked out with the aid of carefully prepared 
cross sections. 
The oil has a gravity of 30° to 35° B. and resembles that derived 
from the same formation north of the Santa Clara, especially that from 
the region of Fourfork and Tar creeks. The depth of the wells varies 
from 600 to 2,000 feet, the deeper wells being those farther away from, 
the axis of the fold. North of the Torrey anticline the productive 
territory is apparently confined to the east end of the field where the 
distance from the syncline immediately north and from the fracture 
possibly accompanying it is greatest. 
Concerning the extent of the Torrey field beyond the present devel¬ 
oped area, it may be said with some degree of assurance that to the 
west and north it is likely to be limited by structural conditions to 
nearly the existing lines. In the other directions no prediction can 
be made. 
EUREKA WELLS. 
The wells of Eureka Canyon are located in its lower reaches, most 
of them being grouped at the sharp turn half a mile above its mouth. 
The geology of the immediate region is somewhat doubtful, but if the 
structure is that of a highly compressed compound fold, as suggested 
on page 82, the locus of the wells is not far from its anticlinal axis; 
moreover, the developed territory is in the vicinity of a prominent 
curve in the stratification planes, the axis having been pushed some¬ 
what northward between Eureka and Torrey canyons. The wells 
