Scientists discover an ancient forest inside a giant sinkhole in China

Cave explorers stumbled upon a prehistoric forest at the bottom of a giant sinkhole in South China earlier this month. Sinkholes such as these are also known in Chinese as Tiankeng, or "Heavenly pit." At 630 feet deep, the sinkhole would hide the ...

source https://www.npr.org/2022/05/20/1100459262/giant-sinkhole-china-ancient-forest