| 1. | Thus clays and shales tend to be impermeable .
因此粘土和页岩就往往不透水。 |
| 2. | Sandstones are, as a rule, interbedded with shales .
砂岩通常都与页岩互层。 |
| 3. | The sandstone and shale units are of the same age .
砂岩和页岩单元是同时的。 |
| 4. | Alternating sandstones and shales are regarded as important .
蚀变的砂岩和页岩是很重要的。 |
| 5. | The limestone, sandstone and shale of this area were soft .
这个地区的灰岩、砂岩和页岩都是很柔软的。 |
| 6. | We must find economical methods for extracting oil from shale .
我们必须找到从页岩中采油的经济方法。 |
| 7. | 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。 |
| 8. | The age equivalence of fossils found in the sandstone and the shale is thus demonstrated .
发现于砂岩和页岩中化石的等时性就这样得到证明了。 |
| 9. | In estonia three types of shale tar have been used as alternatives to anthracene oil or carbolineum .
在爱沙尼亚，已有三种页岩焦油用作蒽油或氯化蒽油的替换物。 |
| 10. | Uranium is frequently enriched by sorption or chemical combination in shales, lignites and phosphorites .
铀经常为页岩，泥炭和磷块岩所吸附或化学结合态而富集。 |
