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suhteliselt palju orgaanilist ainet sisaldava järvemuda kõvastudes tekkinud põlev maavara, fossil coals formed as a result of the decay of organic matter in bottom sediments of water bodies, ископаемые угли, образовавшиеся в результате выгнивания органических веществ в донных отложениях водоемов
sapropelic rock . Limnoloogia sõnastik. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//lim/sapropelic%20rock/1/eng (20.06.2026)