stratigraphic

例句：

1. 1. The geologist studied the rocks in the area to determine their age.
   地质学家研究该地区的岩石来确定它们的年龄。
2. 2.The stratigraphic record of the ancient civilization is still being studied.
   古代文明的地层记录仍在研究中。
3. 3. The study of stratigraphy helps us understand the history of our planet.
   地层学的研究帮助我们了解我们星球的历史。