carbonaceous shale

例句：

1. 1. The carbonaceous shale is a valuable resource foroil and gas extraction.
   碳质页岩是石油和天然气开采的重要资源。
2. 2. Thecarbonaceous shale formation is locatedin the northern part of the country.
   碳质页岩层位于该国北部。
3. 3. Thecarbonaceous shale has been usedas an alternative fuel source for decades.
   碳质页岩作为一种替代燃料已经使用了几十年。