Uranium miners discovered a giant patella bone in this region in 1976. Palaeontologists then unearthed a fossilised 15m-long herbivore later named Phuwianggosaurus sirindhornae (after Her Royal Majesty, Princess Sirindhorn). More remains were uncovered and Phu Wiang National Park was born.
Enclosed excavation sites, including one with a partial skeleton of Siamotyrannus isanensis , an early ancestor of Tyrannosaurus rex, can be easily reached on trails from the visitor centre or nearby parking areas.
