Seatearth
Seatearth is a British coal mining term, which is used in the geological literature. As noted by Jackson, a seatearth is the layer of sedimentary rock underlying a coal seam. Seatearths have also been called seat earth, "seat rock", or "seat stone" in the geologic literature. Depending on its physical characteristics, a number of different names, i.e. underclay, "fireclay", flint clay, and "ganister" can be applied to a specific seatearth.
Underclay
Underclay is a seatearth composed of soft, dispersible clay, or other fine-grained sediment, either immediately underlying or forming the floor of a coal seam. Underclay typically contains the fossil roots and exhibits noticeable development soil structures. It often has been noticeably altered due to weathering. Underclays, which occur within Carboniferous coal measures, commonly contain Stigmarian roots. Synonyms for underclay included seat clay, root clay, thill, warrant, coal clay, and warrant clay
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