argillaceous sediment

例句：

1. 1.The riverbed is covered with argillaceous sediment.
   河床覆盖着黏土质沉积物。
2. 2.The ancient city was buried under argillaceous sediment.
   这个古老的城市被黏土质沉积物所埋藏。
3. 3. The erosion of the river has caused a significant amount of argillaceous sediment to be deposited in the valley.
   河流的侵蚀导致了大量的黏土质沉积物在山谷中沉积。