Southern California is an unlikely place to find an erratic boulder. Usually, erratics are assumed to have been transported by glacier action. But the beaches of Southern California are not known for their proximity to glacial mountains. I have to speculate about how this rather large rock got placed so prominently on a flat surface next to pounding surf. This rock is in the Point Loma Formation which is mainly sedimentary dating back to the Late Cretaceous epochs of the Cretaceous period, during the Mesozoic Era. See Wikipedia: Point Loma Formation. This rock may be a remnant of the overlying grayish-black siltstone in the top half of the formation.
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