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sometimes causing serious injuries to miners. The surface usually has a scratched, striated, or slickensided appearance and frequently has a slick, soapy, unctuous feel. The origin of this feature is thought to be the remains of the stump of a tree that h
The Dictionary of Mining, Mineral, and Related Terms, 297 (2d ed. 1997) (American Geological Institute) defines "kettle bottom" as follows,
A smooth, rounded piece of rock, cylindrical in shape, which may drop out of the roof of a mine without warning
Explanation: IsabelMaria a trouvé la bonne réponse !
Kettlebottoms are fossilized remains of tree trunks that
are cylindrical or oblong in shape and sometimes protrude from
the mine roof. Although most often cylindrical or oblong,
Kettlebottoms have various shapes and do not all look alike.
Kettlebottoms may be surrounded by a ring of coal, or, they maybe
surrounded by slickensided material that consists of smooth and
highly polished planes of weakness that are primarily found in
mines containing shale roof rock.