sedimentation unit

例句：

1. 1.The sedimentation unit is responsible for the formation of sedimentary rocks.
   沉积单元负责形成沉积岩。
2. 2.The study of sedimentation units is crucial for understanding the geological history of a region.
   研究沉积单元对于理解一个地区的地质历史至关重要。
3. 3. The sedimentation unit was formed by the slow accumulation of sediment over millions of years.
   沉积单元是由数百万年缓慢积累的沉积物形成的。