In this new period of the Cenozoic, which Dixon calls the "Posthomic", Europe and Africa have fused, closing the Mediterranean Sea; whereas Asia and North America have collided and closed the Bering Strait; South America has split from Central America; Australia has collided with Southern Asia (colliding with the mainland sometime in the last 10 million years), uplifting a mountain range beyond the mountains of the Far East that has become the most extensive and the highest chain in the world, greater even than the Himalayas at their zenith 50 million years ago; and parts of eastern Africa have split off to form a new island called Lemuria. Other volcanic islands have been added, such as the Pacaus archipelago and Batavia.