mixed type source rock

例句：

1. 1.The geologist found the mixed type source rock to be a valuable resource for oil exploration.
   地质学家发现混合型岩层是石油勘探的宝贵资源。
2. 2. The study of the mixed type source rock has led to new insights into the formation of petroleum.
   对混合型岩层的研究为石油的形成提供了新的见解。
3. 3. The mixed type source rock is believed to contain traces of ancient life, providing clues to the history of our planet.
   混合型岩层被认为含有古代生命的踪迹，为地球历史提供了线索。