Rare fossils of mass extinction survivors found in China

This remarkable cactus-like organism from the Huayuan Biota is called Allonnia. It’s one of the organisms that survived a major mass extinction 513 million years ago. The red coloring is from iron oxide deposits. The top right scale bar is 5 millimeters long. Image via Han Zeng/ Chinese Academy of Sciences. Used with permission.

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• The Sinsk Event was a major mass extinction 513 million years...