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.

"It's incredible to think that a piece of history this rich was resting in a schoolyard all this time." In 2002, coal miners in Queensland, Australia, uncovered a rock slab with several three-toed footprints preserved in it.

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.

A rock slab displayed at Biloela State High School contains some of the most densely packed dinosaur footprints ever discovered in Australia.

A trove of fossilized dinosaur footprints has been found on a slab of rock gathering dust inside an Australian school, scientists said on Wednesday.

This schoolyard boulder with ancient footprints is revealing a vibrant moment in Australia's prehistoric past.

Scientists say the discovery of 66 footprints on a rock at a Queensland high school are a huge breakthrough in understanding early Jurassic dinosaurs.

Fossilised dinosaur footprints have been discovered on rock that was sat in a school entrance hall for 20 years