 The museum claims the largest number of dinosaur fossils in the world and covers 25,000 square meters with a display area of 3,600 square meters.It attracts up to seven million visitors a year.In 1980s, vast quantities of dinosaur fossils were excavated in the Middle Jurassic Shaximiao Formation, 7 km north-east from downtown Zigong, including a dinosaur named after the township, "Dashanpusaurus".