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.

Learn more about the schoolyard dinosaur discovery, which found 200-million-year-old fossilized footprints on a boulder from Australia's Early Jurassic period hiding in plain sight.

For more than 20 years, a simple white slab sat in the main office of Biloela State High School, blending into the background. It was a relic of the nearby Callide Mine, a gift to the school by a geologist. For most, it was just an impressive rock with multiple chicken-like tracks.