shales的例句（shales在句子中的用法）

• Alternating sandstones and shales are regarded as important. 蚀变的砂岩和页岩是很重要的.
• Oil - yielding organic matter is contained in the shales. 在这些页岩里有产油的有机物质.
• Sandstones are, as a rule , interbedded with shales. 砂岩通常都与页岩互层.
• Thus clays and shales tend to be impermeable. 因此粘土和页岩就往往不透水.
• The ichthyosaur remains are found in black, bituminous marine shales deposited about 190 million years ago. 人们在黑色的 、 含沥青的海洋页岩中发现了约1.9亿年前沉积下来的鱼龙化石.