BEIJING, July 26 (Xinhuanet) -- Archaeologists have discovered silicified
woods in northwest China, which experts say date back to about 180 million years
The discovery is of great value for the scientific research on geology,
geomorphology and paleobiofossil in the area, archaeologists said.
The woodstones, also called paleobio fossils, are regarded as natural relics
that can not be regenerated, archaeologists said, adding that they are important
tangible evidence for the study of geography, climate, earth evolution and
The silicified woods cover an area the size of a football fieldin Baota
district of Yanan in northwest China's Shaanxi Province.
According to archaeologists, silicified woods came from woods buried deep
underground hundreds of thousands of years ago. They became fossilified after
having been soaked by silicate for a verylong time.
The woodstones still bear clear grains and annual rings when
Some of the woodstones have been unearthed and placed at randomon one side
of the hill where they were discovered, while the restare still buried
"Those woodstones stay underground vertically and in a concentrated area,
which is fairly rare in terms of the distribution of fossils," said Zhang
Huaibin, who discovered the silicified woods.
"I hope government departments concerned attach
importance to the protection of the rare natural relics," Zhang said.