a. Eng. Deposits interstratified with coal; Yorkshire and Midland Counties. Nelson
b. A hard earthy clay on the roof of a working place in a coal seam; often a fireclay. CTD
c. A miner's term applied to a soft, weak, or loosely consolidated shale (or to a hard, earthy clay), esp. one found in close association with coal or immediately overlying a coal seam. It is so called because it falls away in lumps when worked. An artificially formed aggregate of soil particles. AGI
d. A clod of dirt, of greater or less diameter, thin at the edges and increasing in thickness to the middle. See also: kettle bottom
e. An artificially formed aggregate of soil particles.
Source:
Dictionary of Mining, Mineral, and Related Terms












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