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汉语拼音：dì céng

地壳发展过程中所 形成的各种成层岩石（包括松散沉积层）及其间的非成层岩石的总称。地层是研究地壳发展历史的重要根 据。

1. 地壳是由一层一层的岩石构成的，这种岩石的系统叫地层。

• Minerals are often found deep in the ground.

  矿物往往埋藏在地层深处.

• The role of vegetation in outlining formations is often of great help.

  在圈定地层过程中,植被往往具有很大的作用.

• We regard them as actural stratigraphic units produced primarily by magmatic sedimentation.

  我们把它们当作实际上的地层单元来考虑,它们主要由岩浆沉积作用所产生.

• The component layers have the geometry of stratigraphic units.

  一分层具有地层单元的几何形态.

• A compressed horizontal scale commonly is helpful in seeing stratigraphic changes.

  缩小水平比例尺一般有助于观察地层变化.

• The stratigraphic column in this district includes all the Paleozoic formations.

  这个地区的地层柱包括全部古生代岩系.

• We can follow the history of life through the strata.

  我们可以通过这一层层的地层跟踪生命的历史.

• Stratigraphy studies the sequence of the rocks in the earth's crust.

  地层学研究地壳中岩石的层序.

• The gas accumulation is controlled entirely by stratigraphic parameters.

  气的聚集完全受地层参数的控制.

• The continental beds are as thick as their marine time equivalents.

  陆相地层与其时代相同的海相地层具有一样的厚度.

• These plates move because they lie upon a soft, hot underlayers.

  这些板块处于柔软 、 炽热的地层上,所以会移动.

• Only connected interstices can act as elementary conduits within the formation.

  在地层内只有连通的空隙才能起导水通道的作用.

• The accumulations are atratigraphic and bear no relation to structure.

  聚集作用是地层型的,而与构造无关.

• The portion of the current confined to the surface layer becomes negligible.

  流经上部地层的那部分电流变得可以忽略不计.

• A current is passed through earth materials not containing metallic minerals.

  电流在不含金属矿物的地层介质内经过.