fan-delta facies

例句：

1. 1.The geologist used a fan-delta facies to study the sedimentary rocks.
   地质学家使用扇形地层来研究沉积岩石。
2. 2. The fan-delta facies is a common feature in many marine environments.
   扇形地层是许多海洋环境中的常见特征。
3. 3. The discovery of this fan-delta facies has led to new insights into the history of the Earth's crust.
   这一扇形地层的发现为地球壳层历史的新见解提供了线索。