carbosand

例句：

1. 1.The geologist is studying the formation of sandstone in this area.
   地质学家正在研究这个地区沙岩的形成。
2. 2. The limestone formation has been dated back millions of years.
   石灰岩层被确定有数百万年的历史。
3. 3.The limestone quarry is located near the coast, providing a valuable resource for construction projects.
   石灰石采石场位于海岸附近，为建筑项目提供了宝贵的资源。