Qixia Formation

例句：

1. 1. The Qixia Formation is a significant geological formation in China's northern region.
   栖霞组是中国北部地区的一个重要地质构造。
2. 2. The study of the Qixia Formation has provided valuable insights into the evolution of life on Earth.
   对栖霞组的研究为地球生命演化提供了宝贵的见解。
3. 3. The fossils found in the Qixia Formation are crucial for understanding the history of early human ancestors.
   栖霞组中发现的化石对于理解早期人类祖先的历史至关重要。