tuff ring

A wide, low-rimmed, well-bedded accumulation of hyalo-clastic debris built around a volcanic vent located in a lake, coastal zone, marsh, or area of abundant ground water.
A type of hydroclastic volcano, generally < 50m high, defined by craters with low depth/width ratios that sit at or above the elevation of the adjacent land surface. The rims around tuff rings are composed of juvenile and accidental clasts and are deposited in beds with dips < 25° (Vespermann and Schminke, 2000, p. 684).

Glossary of volcanic terms. - University of Wisconsin Oshkosh. . 2001.

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