stratigraphic map

例句：

1. 1. The geologist is studying the stratigraphic layers in the area.
   地质学家正在研究该地区的地层。
2. 2.The fossils found in the stratigraphic layers provide clues to the past.
   在地层中发现的化石为过去提供了线索。
3. 3. The study of stratigraphy is essential for understanding the history of our planet.
   地层学的研究对于理解我们星球的历史至关重要。