descriptive stratigraphy

例句：

1. 1.The geologist used descriptive stratigraphy to explain the formation of the rock layers.
   地质学家使用描述性地层学来解释岩石层的形成。
2. 2. In this study, we focused on the descriptive stratigraphy of the ancient volcanic eruptions.
   在这项研究中，我们专注于古代火山喷发的地层描述。
3. 3. The descriptive stratigraphy of the region is crucial for understanding its geological history.
   该地区的描述性地层学对于理解其地质历史至关重要。