sedimentary facies of coal-bearing series

例句：

1. 1.The sedimentary facies of the coal-bearing series is crucial for understanding the geological history of the region.
   含煤系列沉积相对于理解该地区地质历史至关重要。
2. 2.The study of sedimentary facies helps us to understand the evolution of the Earth's crust.
   研究沉积相有助于我们了解地壳的演变过程。
3. 3. The sedimentary facies of the coal-bearing series plays a significant role in the formation of oil and gas reservoirs.
   含煤系列沉积相在石油和天然气储层形成中起着重要作用。