How would you like to go back in time millions of years?
One place in the world offers an amazing spectacle: it's Cal Orko, Sucre, Bolivia. A huge limestone wall there is proving to be a treasure trove for paleontologists. It preserved on its rock face thousands of large tracks from a remarkable variety of dinosaurs.
The wall used to be a shallow lake bed, but when the Andes Mountains were formed, the lake bed became a vertical feature. The now climbing tracks are quite amazing. They date back to the Late Cretaceous period, almost 70 million years ago, and include some astounding tracks made by a baby Tyrannosaurus Rex.
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