Liujiagou Formation

例句：

1. 1.The Liujiagou Formation is a significant stratigraphic unit in the region.
   柳吉沟组是该地区一个重要的地层单位。
2. 2. The study of the Liujiagou Formation provides insights into the evolution of ancient rivers and lakes.
   研究柳吉沟组有助于了解古代河流和湖泊的演变。
3. 3.The Liujiagou Formation contains valuable fossils, which can be used to study the history of life on Earth.
   柳吉沟组中含有珍贵的化石，可以用来研究地球上生命的历史。