地层

1. 地下蓄水层，砂石含水层含有水的泥、砂砾或多孔石的地下河床或地层
   An underground bed or layer of earth, gravel, or porous stone that yields water.
2. 地幔位于地壳和地核之间的地层
   The layer of the earth between the crust and the core.
3. 单斜结构一种所有地层朝同一方向倾斜的地质结构
   A geologic structure in which all layers are inclined in the same direction.
4. 地层，岩层处于土地的垂直横截面中的某一具体土层或次土层
   A specific layer of soil or subsoil in a vertical cross section of land.

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