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Welded tuff

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A pyroclastic-rock, of any origin, that was sufficiently hot at the time of deposition to weld together. A glass-rich pyroclastic rock that has been indurated by the welding together of its glass shards under the combined action of the heat retained by particles, the weight of overlying material, and hot gases. It is generally composed of silicic pyroclasts and appears banded or streaky.

Synonym of: tuff lava


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