1. The stratigrapher carefully analyzed the layers of rock to determine their age and composition.
地层学家仔细分析了岩层，以确定其年代和组成。

2. As a stratigrapher, she specializes in studying the geological history and formation of sedimentary layers.
作为一名地层学家，她专攻研究沉积层的地质历史和形成过程。