By Zhao Xinying in Xi'an |
chinadaily.com.cn |
Updated: 2020-06-23 13:37
Share
Share - WeChat
CLOSE
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.
Copyright 1995 - . All rights reserved. The content (including but not limited to text, photo, multimedia information, etc) published in this site belongs to China Daily Information Co (CDIC). Without written authorization from CDIC, such content shall not be republished or used in any form. Note: Browsers with 1024*768 or higher resolution are suggested for this site.