. Oil and gas yielding formations of California. ara River at Piru ; if pro-longed to the east, it would pass into the hills east of Piru Creek. Fold BB, as observed at Station 4, is an inclined fold, itssouthern limb being the steepest. The axis of this fold may be followedwestward from Station 4 to Hopper Creek, where the fold is upright*At Station 4, the fold is evidently faulted at its axis, the upthrowbeing to the north. Near Station 4, there is an oil-spring and a wide out-crop of oil-sand. The southern limb of the fold is a very short one andis inclined at a very great angle. Oi
. Oil and gas yielding formations of California. ara River at Piru ; if pro-longed to the east, it would pass into the hills east of Piru Creek. Fold BB, as observed at Station 4, is an inclined fold, itssouthern limb being the steepest. The axis of this fold may be followedwestward from Station 4 to Hopper Creek, where the fold is upright*At Station 4, the fold is evidently faulted at its axis, the upthrowbeing to the north. Near Station 4, there is an oil-spring and a wide out-crop of oil-sand. The southern limb of the fold is a very short one andis inclined at a very great angle. Oil-springs are marked with onestar on the accompanying map. Farther eastward along this fold, alltraces of a southern dip disappear as Piru Creek is direction and angle of the dip are very irregular, and there is animmense outcrop of sand more or less impregnated with petroleum. Itis not improbable that at this point fold BB is overturned ; i. e., bentover toward the south to such an extent that all the strata dip towardthe PHOTO 23. Concretionary Strata, Whitish Sandstone Formation, near Fortuna Oil-Wells, Ventura County.
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