 Sections of oceanic crust which overlie continental crust are known as ophiolites.Gros Morne National Park was designated a UNESCO World Heritage Site because it is one of the best places in the world to see the effects of plate tectonics and one of the few places where rocks formed at the Mohorovicic Discontinuity between the crust and the upper mantle of the Earth can be seen.Another notable geology site is at Mistaken Point, where rocks containing probably the oldest metazoan fossils in North America and the most ancient deep-water marine fossils in the world are found preserved in layers of volcanic ash.