petrographic facies

例句：

1. 1.The study of petrography is crucial for understanding the formation of rocks.
   研究岩石学对于理解岩石的形成至关重要。
2. 2. The petrographic facies of the area has been studied extensively.
   该地区的岩石相已经得到了广泛的研究。
3. 3.The petrographic facies plays a significant role in shaping the geological landscape.
   岩石相在塑造地质景观中起着重要作用。