In between are several layers of dense shale rock.

中间是几层致密的页岩。

The land at the bottom of the sea was black shale rock.

海底的土地是黑色页岩岩石。

And fracking has unleashed a flood of oil formerly trapped in shale rock underneath North Dakota, among other places.

液压破碎法将北达科他州及其他地区页岩下的石油大量开采出来。

And as it turned out, the Permian too was absolutely covered with previously inaccessible petroleum-rich shale rocks beneath the surface.

而事实证明，二叠纪盆地的地表下也绝对覆盖着以前无法触及的富含石油的页岩。

The energy giant Royal Dutch Shell has signed a deal with Ukraine to extract natural gas trapped underground in shale rock.

石油巨头荷兰皇家壳牌与乌克兰签署协议，该公司将开采页岩下的天然气。

It's a huge industry, devoted to cracking the shale rock thousands of feet beneath the ground and freeing the precious fossil fuels inside.

这是一项巨大的产业, 致力于凿开地下数千英尺下页岩将里面的珍贵化石燃料释放。

But U.S. companies are recovering less gas from shale rock formations.

但美国公司从页岩层中回收的天然气越来越少。

And so the state consequently had a massive, massive amount of petroleum-rich shale rock deposits beneath its surface, ripe for the new fracking technique to exploit.

因此，该州地表下蕴藏着大量富含石油的页岩矿床，为新的水力压裂技术提供了成熟的开采条件。

It turns 90 degrees and extends horizontally for about 1.5 kilometers through a compressed black layer called the shale rock formation.

它旋转 90 度并水平延伸约 1. 5 公里，穿过称为页岩岩层的压缩黑色层。

In the famed Burgess Shale rock formation, paleontologists discovered hundreds of fossils of a horseshoe crab–shaped, prehistoric predator that lived in the ocean 506 million years ago.

加拿大：在著名的伯吉斯页岩岩层中，古生物学家发现了数百块生活在 5. 06 亿年前海洋中的马蹄蟹形史前捕食者的化石。

Fracking fluid is pumped down into the well at a pressure so high, it cracks the shale rock, creating fractures through which the trapped gas and oil can escape.

压裂液在如此高的压力下被泵入井中，它使页岩破裂，形成裂缝， 被困的天然气和石油可以通过这些裂缝逸出。