Chalk Marl

例句：

1. 1.The beach is covered in a layer of soft sand and chalky marl.
   海滩上覆盖着一层柔软的沙子和粉砂岩。
2. 2. The builders used the chalky marl to create the walls of the new building.
   建筑工人使用粉砂岩来建造新建筑的墙壁。
3. 3. The ancient city was built on top of a layer of chalky marl that had been eroded by the sea for centuries.
   这个古老的城市建在一层被海侵蚀了数百年的粉砂岩之上。