Around the water holes thick mud trapped the heavier creatures that now are found as fossils. Among these are examples of the 2,5 metre-long Bradysaurus, so often found with heads tilted up, indicating that they could not free themselves and so suffocated. In time, they became extinct. After millennia, the climate became drier and dinosaurs inhabited the ancient deserts. Since 120 million years ago the Great Karoo has been eroded into the vast plains and flat-topped mountains of today.