As far back as 9,400 years ago, hunter-gatherers in what is now Brazil created dozens of stunning rock-art designs next to the fossilized footprints of dinosaurs, a new study finds.
Researchers described the petroglyphs and dinosaur tracks, which date to the Cretaceous period (145 million to 66 million years ago), in a study published March 19 in the journal Scientific Reports. They think ancient humans purposefully put the rock art next to the dinosaurs' prints, as many of the petroglyphs are a mere 2 to 4 inches (5 to 10 centimeters) from the fossilized marks and some of the glyphs appear to be illustrations of the prints.
