Dozens of dinosaur footprints embedded in a boulder were found hiding in plain sight at a school in Australia, according to researchers. The large rock was excavated from the Callide Basin in central Queensland and gifted to the Moura State High School,

A slab of rock at an Australian high school, a boulder in a parking lot, and a bookend in a private collection feature 200-million-year-old dinosaur footprints.

For two decades, students walked past an unassuming beige rock on their way to and from class—and occasionally stuck wads of used chewing gum on it. Now, paleontologists have discovered the slab is covered in 200-million-year-old dinosaur tracks,