Dawan Formation

例句：

1. 1. The Dawan Formation is a significant geological formation in the region.
   大湾组是该地区的一个重要地质构造。
2. 2.The Dawan Formation contains fossils that are millions of years old.
   大湾组包含数百万年历史的化石。
3. 3.The study of the Dawan Formation has led to new discoveries about the Earth's history.
   对大湾组的研究已经揭示了关于地球历史的新发现。