Horizon has gained exclusive access to one of the most important dinosaur sites in the world of paleontology. Located on a remote plateau in Patagonia, Argentina, scientists believe this incredible dinosaur graveyard could be one of the most significant finds ever. It is from the most crucial and mysterious period of dinosaur evolution - a period scientists call the mid Jurassic. Before the mid Jurassic the dinosaurs were mostly small and not very impressive. By the Late Jurassic they had grown to be the biggest creatures ever to walk the Earth. But the period in between, when this spectacular transformation took place, is virtually unknown to science. But now the new site is beginning to fill in the evolutionary black hole at the heart of the story of what made the dinosaurs the amazing creatures which dominated the planet for so long.
