沙岩

例句：

1. 1. The ancient city is built on the sandstone cliffs.
   这个古城建在沙质悬崖上。
2. 2. Limestone is a common building material in many parts of the world.
   石灰石是世界上许多地方常见的建筑材料。
3. 3. The geologists are studying the fossils found in the sandstone layer.
   地质学家正在研究在沙质层中发现的化石。