stratified seam sample

例句：

1. 1. Therocks are stratified in layers that can be easily identified.
   这些岩石是分层的，层次分明，易于识别。
2. 2.The fossils found in the stratified sediments provide important clues about the history of life on Earth.
   在分层沉积物中发现的化石为研究地球上生命的历史提供了重要线索。
3. 3. The geologist used a microscope to study the stratified layers of the rock.
   地质学家使用显微镜研究了岩石的分层结构。