1. A single shaft, or an entire cave system that is dominantly vertical. It is also used to describe a single erosional bowl or moulin, rounded mainly by the swirling current, in a stream bed [9].
   2. A small rounded hole pipe worn into the bedrock of a streambed, or on the coast, or at a waterfall, by sand, gravel, and stones spun around by the current in evorsion or mill action [20].
   3. Term used in England for vertical or steeply inclined shaft in limestone [10].
   Synonyms: (French.) marmite de géant, aven; (German.) Kolk, Strudelloch; (Greek.) strongíli opí is petróthi kítin révmatos; (Italian.) marmitta dei giganti; (Russian.) karstovaja sahta; (Spanish.) marmita de gigante, pilancón; (Turkish.) dev kazan2; (Yugoslavian.) erozioni kotas.
   See also pit; shaft.

A Lexicon of Cave and Karst Terminology with Special Reference to Environmental Karst Hydrology. . 2002.

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