1·Sandstones generally make good aquifers, while finer-grained mudstones are typically impermeable.
砂岩通常是良好的含水层，而细粒泥岩通常是不透水的。
2·Because they are porous, sedimentary rocks, such as sandstones and conglomerates, are important potential sources of groundwater.
由于像如砂岩和砾岩这样的沉积岩是多孔的，它们是地下水的重要潜在来源。
3·It intruded Eocene sandstones.
它侵入始新世砂岩。
4·Sandstones are, as a rule, interbedded with shales.
砂岩通常都与页岩互层。
5·The coarsest sandstones intercalated with grey mudstones.
最粗粒砂岩与灰色泥岩成互层。
6·Alternating sandstones and shales are regarded as important.
蚀变的砂岩和页岩是很重要的。
7·Well-sorted quartz sandstones are generally not very abundant.
分选良好的石英沙岩一般并不十分丰富。
8·The sandstones are mainly coarse, medium-coarse and medium sandstones.
砂岩以粗砂岩、中粗砂岩和中砂岩为主。
9·These sandstones are interpreted as having originally been point bar deposits.
这些砂岩在成因上被解释为点沙坝沉积。
10·Fluvial deltaic sandstones is a main reservoir rocks in shengtuo, Gudao, Dongxin oilfield.
河流、三角洲相砂岩为胜坨、孤岛、东辛等油田的主要储集层。