geochemical fossil

例句：

1. 1.The discovery of this geochemical fossil has sparked a new era in paleontology.
   这一地质化学化石的发现为古生物学开辟了新纪元。
2. 2.This geochemical fossil is believed to have been formed over 300 million years ago.
   据信这种地质化学化石是在3亿多年前形成的。
3. 3. The geochemical fossils found in the cave are thought to be evidence of ancient life on Earth.
   在洞穴中发现的地质化学化石被认为是地球古代生命的证据。