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