Coffin lid
Coffin lid is a term from the miners' language and describes a flat and large rock body suddenly detaching itself from the hanging wall at existing dividing surfaces . Because of the suddenness of the event, coffin lids are feared by the miners .
literature
- Paul Kukuk: Our coals. An introduction to the geology of coals, taking into account their extraction, use and economic importance . In: Nature and Spiritual World . 2nd edition 1920 edition. tape 396 . Teubner, 1913, p. 120 ( books.google.de [accessed on March 21, 2010]).