Fossil discovery aids sinkhole researchers

By Zhao Xinying in Xi'an | chinadaily.com.cn | Updated: 2020-06-23 13:37
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Aerial photo of a sinkhole. [Shui Xiaojie for China Daily.]

They were active about 320 million to 250 million years ago. The name tinghuashi, meaning the fossil of a spindlelike worm, was established by renowned geological expert Li Siguang in 1934 and has been widely used since then.

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