I was at a beach in Mexico and the tide went out, revealing exposed rocks and tidal pools. I walked out to get a better look and came to a large rock out-cropping. It was perhaps 10 meters high and 20 meters long. There were compartments in the face of the rock with large shells of different varieties in each compartment. It was spectacular but I didn't get that I was dreaming. Then my father-in-law, who died 7 years ago, showed up and wanted to drive my wife and I to a bridge nearby. As we drove I tried to remember something concerning a bridge. About a month ago I had a dream in which I crossed a bridge over the river Styxx, the river that separates the living and the dead.