Nanjinguan Formation

例句：

1. 1. The Nanjinguan Formation is an important part of the geological record.
   南京组系是地质记录中的一个重要部分。
2. 2. The discovery of this formation has led to new insights into the history of our planet.
   这一组系的发现为我们了解地球历史提供了新的见解。
3. 3. The Nanjinguan Formation is characterized by its unique rock types and their association with specific environmental conditions.
   南京组系以其独特的岩石类型和与特定环境条件的关联而著称。