页岩

• Thus clays and shales tend to be impermeable .
  因此粘土和页岩就往往不透水。
• Sandstones are, as a rule, interbedded with shales .
  砂岩通常都与页岩互层。
• The sandstone and shale units are of the same age .
  砂岩和页岩单元是同时的。
• Alternating sandstones and shales are regarded as important .
  蚀变的砂岩和页岩是很重要的。
• 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。
• 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。
• 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。
• 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。
• 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。
• 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。