A broad, shallow crater, typically filled by a lake, formed by a volcanic eruption with little lava.
- Monogenetic volcanoes are small and occur as scoria cones, tuff cones and rings, and maars; they form from single, typically brief eruptions.
- However, with an initial diameter of about 1,500 m the Messel maar was certainly considerably larger than the Eckfeld Maar.
Early 19th century: from German dialect, originally denoting a kind of crater lake in the Eifel district of Germany.
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