In Bolivia, there is a wall with a height of 30-storey building length of 1, 2 km away. with well-preserved dinosaur tracks - a unique archaeological site. About 68 million years ago, during the second half of the Cretaceous period, the area was the bottom of the lake. Later, the movement of tectonic plates raised the bottom of almost vertically. In total there are 5 thousand. Traces left 294 different dinosaurs.