The sea caves at La Jolla Cove are some of the best in Southern California. They are formed within fractured sandstones and mudstones of the Cretaceous Point Loma Formation. Deep within some of these caves, flowstone, stalactites, and stalagmites exist. Negative tides, particularly in the -1.0+ range, allow for hiking to most of the caves with relative ease. I still recommend a wetsuit for such a hike, as it can get a bit wet at times.