Jingyuan Formation

例句：

1. 1. The study of the Jingyuan Formation is crucial for understanding theevolution of life on Earth.
   研究京元系地层对于理解地球上生命演化至关重要。
2. 2.The Jingyuan Formation contains awealth of information about the ancient civilizationsthat lived there.
   京元系地层包含了关于那里古代文明的丰富信息。
3. 3. TheJingyuan Formation has been dated to be around 50 millionyears old, making it one of theoldest known geological formations in theworld.
   京元系地层被确定为大约5亿年前，是世界上最古老的已知地质形成之一。