Imagine you can travel back in time,to a time long before man. Across 66 million years. As you travel you would see huge changes in the vegetation and climate. Even the surface of Earth itself would move as mountain ranges a pushed up by colliding continents. Now you're reached a remarkable period in Earth's history known as the Cretaceous. It is a very different world-the Himalayas do not yet exist and the Atlantic only half as wide. There is no grass, only conifer forests and fern prairies. This is a world ruled by dinosaurs...
