Boy finds 200-million-year-old fossil on the beach of Llantwit Major in Wales. The ammonite is about 30 centimeters in diameter and not only unusual for this reason.
The inner chambers that were used for buoyancy by the ammonite were filled with quartz during fossilization, which is even rarer and makes this specimen particularly beautiful. Ammonites are cephalopods with shells that became extinct millions of years ago. They lived on Earth until 65 million years ago and became extinct at the same time as the dinosaurs.