chemical stratigraphy

• 化学地层学

chemical stratigraphy的用法和样例：

例句

1. Stratigraphy studies the sequence of the rocks in the earth's crust.
   地层学研究地壳中岩石的层序。
2. From the view of stratigraphy, they all belong to the Cretaceous period.
   从地层学上看，它们都属于白垩纪。