. Oil and gas yielding formations of California. ped on the east side of the fold. It will beobserved that the oil-line runs parallel to, and at no great distancefrom, the axis of the fold. Distance DA represents the breadth of the oil-line, which is supposedto include only two rows of wells, for east of point A the oil-sand mightlie too deep to be profitably reached by the drill. If the^ investigationsshowed that the geological formation had been thrown into a fold suchas that shown in Fig. 19 and an oil-line had been developed on the eastside of the fold, it would be reasonable to expect the
. Oil and gas yielding formations of California. ped on the east side of the fold. It will beobserved that the oil-line runs parallel to, and at no great distancefrom, the axis of the fold. Distance DA represents the breadth of the oil-line, which is supposedto include only two rows of wells, for east of point A the oil-sand mightlie too deep to be profitably reached by the drill. If the^ investigationsshowed that the geological formation had been thrown into a fold suchas that shown in Fig. 19 and an oil-line had been developed on the eastside of the fold, it would be reasonable to expect the existence of asimilar oil-line on the opposite or west side of the fold, and that, likethe oil-line on the east side, it would run parallel to, and at no greatdistance from, the axis of the fold. (See Fig. 20.) On the west side ofthe fold the angle of the dip is less than it is on the east side. There-fore, the oil-line is wider on the west than on the east side of the fold,thus permitting more than two rows of wells to be drilled with PHOTO 35. OvEUTtKNED Fold, San Pedro Peninsula, Los Angeles County.
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