Tourists visit the Zigong Dinosaur Museum in Zigong, Southwest China's Sichuan Province. Photo: Courtesy of the Zigong Dinosaur Museum

Fossils of pterosaurs, stegosaurs, plesiosaurs, and more - this dinosaur fossil site in Southwest China's Sichuan Province showcases numerous prehistoric creatures that surpass the diversity seen in the Jurassic World movies.

It is the Dashanpu Middle Jurassic Dinosaur Fossils Site, located in Zigong, a city in southern Sichuan Province. As one of the world's most renowned dinosaur fossil sites, it has an excavated area of nearly 3,000 square meters, uncovering tens of thousands of fossilized bones from over 200 individual dinosaurs and other vertebrates from 160 million years ago.

At the recent 37th International Geological Congress held in Busan, South Korea, the Dashanpu Middle Jurassic Dinosaur Fossils Site was listed as a Geological Heritage Site by the International Union of Geological Sciences (IUGS).

"The richness in number, diversity of species, concentration of burial, and the preservation quality of dinosaur and other vertebrate fossils at the site is unmatched globally," Jiang Shan, director of the research department at the Zigong Dinosaur Museum, told the Global Times.

Scientific value

The Dashanpu site was once a lake-delta environment during the ­mid-Jurassic period. This lush and water-rich landscape combined with warm and humid climatic conditions provided a perfect environment for dinosaurs and other vertebrates to thrive. 

When dinosaurs died on a large scale for various reasons, periodic large floods swept their bodies into the area. As water flow slowed at the lake's entrance, many dinosaur carcasses settled and were quickly buried, undergoing petrification over millions of years. Over time, the accumulation of fossils created a vast and spectacular dinosaur graveyard.

The fossil site boasts the most concentrated dinosaur fossil deposits, many of which are well preserved. Among the notable finds are the best-preserved eusauropoda known to date and the most complete primitive stegosaur globally. 

"This site not only fills a significant gap in the sparse mid-Jurassic dinosaur fossil record, but also provides extremely valuable materials for the study of early dinosaur systematics," said Zeng Xiaoyun, director of the Zigong Dinosaur Museum.

The site also features the richest assemblage of mid-Jurassic terrestrial vertebrate fossils. Prior to this discovery, mid-Jurassic dinosaur fossils were sporadically found in North Africa, East Asia, Western Europe, and Australia, leaving a limited understanding of dinosaurs from this period. 

The discovery at Dashanpu opens a window into the mid-Jurassic terrestrial fauna. During this time, the Dashanpu area was home to a variety of carnivorous and herbivorous dinosaurs, as well as fish, amphibians, crocodiles, and flying pterosaurs, forming a highly concentrated and diverse mid-Jurassic dinosaur fossil community.

The application process for the second batch of 100 geological heritage sites recognized by the IUGS began at the beginning of 2023. A total of 10 geological heritage sites from China were submitted, of which three were selected. After more than a year of evaluation by experts, the final list was announced by competing against 174 candidate sites from 64 countries. 

"The inclusion of the Dashanpu Middle Jurassic Dinosaur Fossils Site highlights the scientific value and research standards of the site, as well as the international recognition of the protection measures implemented by the Zigong Dinosaur Museum," Jiang said.

An interior view of the Zigong Dinosaur Museum in Zigong, Southwest China's Sichuan Province Photo: Courtesy of the Zigong Dinosaur Museum

Digitalized preservation

In 1987, the Zigong Dinosaur Museum was established on the fossils site, which is currently the most comprehensive museum in the world for showcasing mid-Jurassic dinosaur fossils. It has served as the core of the Zigong Global Geopark, recognized by UNESCO as a key site for geological and paleontological research.

The museum's collection primarily features Mesozoic dinosaur specimens, covering paleontology, petrology, and mineralogy, including many of the finest specimens from the Dashanpu site, ranging from large and complete dinosaur skeletons to the smaller fossilized remains of other vertebrates.

Among its treasures are a preserved dinosaur fossil area of 1,350 square meters, world-class specimens of significant scientific value, such as the most complete and primitive stegosaur, and China's first stegosaur skin impression fossil. 

"These invaluable fossils provide crucial material for research on dinosaur classification, physiological traits, and evolutionary history," Huang Xinyue, deputy director of the office at the museum, said. 

The museum has used digital technology to enhance its preservation and research efforts. According to He Xu, a senior engineer at the museum, it has digitized its collections, creating 3D models of its key fossils to ensure that they are accessible to researchers around the world. 

"We will continue to strengthen the preservation and utilization of cultural and natural heritage, using modern technologies such as artificial intelligence, big data, and virtual reality to establish a digital dinosaur museum," said Zeng, the museum director.

Since the Zigong dinosaur fossils first traveled to Hiroshima, Japan in 1989, they have been exhibited in more than 30 cities across nine countries and regions, including Japan, Thailand, Denmark, the US, South Africa, South Korea, Australia, New Zealand, China's Hong Kong SAR, and the island of Taiwan.

The museum also hosts international academic conferences and collaborates with foreign universities and research institutions to promote the study of dinosaur evolution and mid-Jurassic ecosystems.

According to Jiang, the museum has been strengthening collaboration with domestic and international universities and research institutions, such as Stony Brook University in the US, the University of Bonn in Germany, the University of Hong Kong, the China University of Geosciences (Beijing), and the Institute of Vertebrate Paleontology and Paleoanthropology at the Chinese Academy of Sciences.

"Through synergistic innovations involving museums, universities, and research institutes, the museum aims to support the advancement of dinosaur fossil research and preservation," Jiang noted.