Pangea was a supercontinent that existed from about 300 to 200 million years ago. It included most of the continental crust of the Earth. Pangea formed during the late Paleozoic Era when several smaller continents collided, welding together to form a single supercontinent. It was surrounded by Pantalassa, the ancestral Pacific. Pangaea was first written about by Alfred Wegener in his theory of continental drift.