stratographic

例句：

1. 1.The geologist is studying the stratigraphy of the region.
   地质学家正在研究该地区的地层学。
2. 2.The fossils found in the stratigraphic layer are evidence of ancient life.
   在地层中发现的化石是古代生命的证据。
3. 3. The stratigraphic record shows that the Earth's crust has been changing over time.
   地层记录显示，地球的地壳一直在随着时间的推移而变化。