Scientists are conducting research on a site where an earlier generation of paleontologists had first begun their work, with the hope of unveiling more of the story from the Late Cretaceous period, Cheng Yingqi reports

The village of Jingangkou, 10 km southeast of Laiyang, Shandong province, is like any farming community. Houses dot the landscape of green patchwork fields. Vegetables grow in the lush soil. But the mountains surrounding the village hold an archeological treasure - large bleached bones. After two months of digging in the red mountainous terrain, paleontologists have excavated more than 200 dinosaur bones since July. "The soil of Laiyang has preserved the most complete remains of dinosaurs living from the Late Cretaceous period (100 to 66 million years ago)," said Wang Xiaolin, a professor of the Institute of Vertebrate Paleontology and Paleoanthropology at the Chinese Academy of Sciences.

"And what makes this site so important is that it is one of the few sites that are rich both in dinosaurs and in dinosaur eggs."

Wang and his team have been carrying out research in Laiyang since 2008.

Their work, Wang said, is like "extending a salute to the older generation".

In fact, Laiyang is the first dinosaur fossil site in China discovered by Chinese scientists. The earliest excavation dates back to 1923 when Chinese geologist Tan Xichou collected fossils of dinosaur, fish, insects and plants in Jiangjunding (near Jingangkou) and neighboring areas.

The first Laiyang dinosaur, Tanius sinensis, was named in honor of Tan by Carl Wiman, a Swedish paleontologist, in 1929.

In the 1950s, Yang Zhongjian, a leading vertebrate paleontologist in China, led a team to Laiyang.

They dug up fossil vertebrates and recovered China's first complete dinosaur skeleton Tsintaosaurus spinorhinus Young in 1958.

Also, fossils unearthed in Laiyang helped build up the international classification system and naming system for dinosaur eggs.

In 1984, the Society of Vertebrate Paleontology of China was established in Laiyang.

However, as more and more dinosaur and other vertebrate fossil sites were discovered in China, paleontologists swarmed to other sites, and Laiyang faded from scientists' view.

"The most significant paleontological finds in the recent decade were carried out on the fossil sites in Liaoning province," Wang said.

Wang led a scientific research team in west Liaoning for 15 years excavating large quantities of amphibian, dinosaur, pterosaur, bird and mammal fossils.

Yet Wang was always attracted by Laiyang, a site of huge potential.

"Geological records show the excavation at Jingangkou was not finished, and the fossils were in a relatively small area, and covered a host of dinosaur species," Wang said.

"When I saw the geological fault in the mountains and the valley, I knew that this type of landscape preserves fossils."

The problem was, where to start.

The exact places where Tan Xichou and Yang Zhongjian excavated had been long forgotten.

Wang's team carried out extensive geological surveys and interviewed elderly residents hoping they would still remember Tan's excavation 90 years ago.

During the search, the team found a site full of broken dinosaur bones - which they call the second site - and they started the excavation.

One of the aims of this new excavation is to find new species, Wang said.

The nasal features of Tsintaosaurus is one such question.

Previous research indicated the nose of Tsintaosaurus was directed up, different from other known lambeosaurids, a genus dinosaur that lived about 76 to 75 million years ago in the Late Cretaceous period.

But tests on Tsintaosaurus, which is currently stored in the Paleozoological Museum of China, show the nasal feature differing from the research, Wang explained. He hopes the excavation can help solve the puzzle.

Also, Wang hopes to uncover a specimen of Tanius sinensis from the Late Crustaceous period.

The only skeleton is stored in Uppsala University, Sweden.

Wang's work in Laiyang started as early as 2008.

But site conditions held back excavation as Wang tried to protect exposed fossils.

When Wang arrived at the site, the fossilized bones exposed to air had cracked and they had become fragile and powdery.

After spending a harsh winter in Laiyang with the fossils, Wang found that the fossilized bones cracked due to the change of temperature.

"So, if we can keep the fossils from freezing, they will be preserved in better shape."

In 2009, the city government of Laiyang became involved in protection of the site and its fossils and provided facilities and personnel support for the team.

So why not just move the fossils away to preserve them in a laboratory?

"It depends on your purpose," Wang said.

If researchers need to dig the fossils out for scientific study it is better to ship them to the laboratory.

But for research purposes, it is better to keep them at the original site, he said.