carbonaceous shale

• 碳质页岩

carbonaceous shale的用法和样例：

例句

1. Thin layers of sandy shale, and carbonaceous fragments are locally present.
   局部出现砂质页岩薄层和碳质碎屑。
2. In the stone coal layer and the overlying black shale, there is a pyrite layer.
   在石煤层或其上部的碳质页岩中含黄铁矿层。