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A stratum of clay lying beneath a coal bed, often containing the roots of coal plants, especially the Stigmaria.

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Definitions

  1. n. A stratum of clay lying beneath a coal bed, often containing the roots of coal plants, especially the Stigmaria.
  2. A stratum of clay lying beneath a coal bed, often containing the roots of coal plants, especially the Stigmaria.
  3. A stratum of clay lying beneath a coal bed, often containingthe roots of coal plants, especially the Stigmaria.
  4. n. A stratum of clay lying beneath a coal bed, often containing the roots of coal plants, especially the Stigmaria.