Paleo-artists may have used hallucinogenic drugs to make the engravings. The patterns were created between 3,000 and 9,000 years ago.
They were made in a region known for its natural beauty and natural resources. The discovery of the patterns is the first time they have been linked to a specific species of dinosaur. They are believed to have been made by a group of people who were under the influence of a hallucinogen, such as LSD or GHB.