Four years later, a scientific team led by Christian Meyer, a Swiss paleontologist of the Natural History Museum in Basel, investigated the wall. According to him, the discovery marks an enormous contribution to humanity and science, revealing data heretofore unknown and “documenting the high diversity of dinosaurs better than any other site in the world.” The dinosaur tracks of the Cal Orck’o paleontological bed date from 68 million years ago and there are more than 5,000 footprints from 293 species of dinosaurs, all made during the Maastrichtian age of the Cretaceous period in the Mesozoic era, the time in which the majority of these enormous beasts lived.
The location used to be the shore of a former lake, which, as an essential water sauce, attracted a large number of both herbivorous and carnivorous dinosaurs. In 2010, a section of the wall broke off, destroying some of the tracks but revealing another layer underneath. It was later discovered that there are at least seven layers of footprints within the dinosaur wall and it is amazing that almost all of the prints are so well preserved that scientists can tell exactly what species they were made by.
Some of the dinosaurs whose tracks have been found are the Ankylosaurus, a herbivore with an armored exterior, the Titanosaur, a plant-eating dinosaur that once weighed more than 100 tons, and Carnotaurus, a predatory animal with small arms and legs. One trackway of a theropod dinosaur can be followed for more than 550 m which make it the longest ever recorded in the world.
Perhaps, the most spectacular set of tracks is 347 meters long, the longest dinosaur trackway ever found, and was made by a baby Tyrannosaurus Rex nicknamed “Johnny Walker” by researchers. The footprints have been turned into a major tourist attraction and there are guided tours available that will take tourists within a few meters of the wall.
In 2009, Bolivia attempted to have Cal Orcko designated as a UNESCO World Heritage Site, but after Francesa had opposed the proposition, the effort was abandoned.
However, as of 2015, the site is in the process of becoming a UNESCO World Heritage Site which will provide findings to help preserve the dinosaur tracks.