. Bulletin of the United States Geological Survey--The Santa Clara Valley, Puente Hills and Los Angeles Oil Districts. ridge in the same strikes and dips vary according to the position of the beds in thefold. It is possible that the anticline continues westward to the BreaCanyon field, being identical with the fold suggested along the line ofseepages in the bottom of the valley. Some irregularity is displayedin the disposition of the strata along the eastern third of Brea Ridge,the Fernando formation being confined to the southern limb of theanticline, though crossing to the north
. Bulletin of the United States Geological Survey--The Santa Clara Valley, Puente Hills and Los Angeles Oil Districts. ridge in the same strikes and dips vary according to the position of the beds in thefold. It is possible that the anticline continues westward to the BreaCanyon field, being identical with the fold suggested along the line ofseepages in the bottom of the valley. Some irregularity is displayedin the disposition of the strata along the eastern third of Brea Ridge,the Fernando formation being confined to the southern limb of theanticline, though crossing to the north of the axis in the region of theColumbia wells (lease No. 2), and possibly farther west, in the ridgebetween the forks of Brea Canyon. How far to the east the anticline extends is undetermined. It doesnot appear in the Fernando at the point of the ridge between Soqueland Telegraph canyons, although the Puente beds here have the oppo-site or northerly dip and half a mile up Telegraph Canyon show dis-tinct evidences of a fold. It may be that the anticline continues U. S. GEOLOGICAL SURVE1 BULLETIN NO. 309 PL. XVI. DETAILED GEOLOGIC SECTION THROUGH OLINDA OIL FIELD. puente hills: olinda field. 131 through to this point, the Fernando, however, no longer bending overthe crown of the arch. The direction which the eastward extension of the Olinda field maytake is somewhat problematic. The development in Columbia ground(lease No. 1) follows the northern fracture, or at least the line of exces-sive disturbance passing up Soquel Canyon to the entrance of Car-bonne Canyon; the surface conditions prevailing in the western halfof the productive territory, however, continue across to TelegraphCanyon, except that the Fernando conglomerate is in contact withlower members of the Puente than to the west. Apparently the bedsare somewhat transitional in their nature, gray micaceous sandstoneand shale lying beneath the Puente sandstone, the precise horizonvarying from point to point. The structure
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