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Pyroclastic identification and geology

Pertaining to fragmental material ejected from a volcanic vent during an explosive eruption, including ash <2 mm , lapilli 2–64 mm , and bombs/blocks 64 mm . Pyroclastic flows hot, fast-moving currents of gas and volcanic debris are among the most deadly volcanic hazards. Pyroclastic deposits lithify into tuff from ash or ignimbrite from pyroclastic flow deposits . Field: volcanology. Example: The pyroclastic flows from the 79 AD eruption of Vesuvius buried the Roman cities of Pompeii and Herculaneum under meters of hot ash and pumice, preserving them in extraordinary detail.. Related terms: Tuff, Ignimbrite, Ash, Explosive eruption.

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  • Tuff

Sources, scope & corrections

These authoritative resources support category-level nomenclature, terminology, identification methods, and safety. When a specimen-specific safety warning appears, the public-health source listed here directly supports that precaution. They are not line-by-line citations for every other property on this entry, and natural specimens vary.

Editorial owner
GeoMiner
Last updated
2026-03-30T15:19:42.055955+00:00
Review status
Published; not independently peer-reviewed
  • USGS Thesaurus — U.S. Geological Survey. Controlled earth-science terminology used to describe USGS information resources.
  • Glossary of Geologic Terms — U.S. National Park Service. Geologic definitions prepared by the NPS Geologic Resources Inventory.

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Common questions

What does Pyroclastic mean in geology?
Pertaining to fragmental material ejected from a volcanic vent during an explosive eruption, including ash <2 mm , lapilli 2–64 mm , and bombs/blocks 64 mm . Pyroclastic flows hot, fast-moving currents of gas and volcanic debris are among the most deadly volcanic hazards. Pyroclastic deposits lithify into tuff from ash or ignimbrite from pyroclastic flow deposits .
What is an example of Pyroclastic?
The pyroclastic flows from the 79 AD eruption of Vesuvius buried the Roman cities of Pompeii and Herculaneum under meters of hot ash and pumice, preserving them in extraordinary detail.
Which earth-science field uses the term Pyroclastic?
Pyroclastic is used in volcanology.
Which terms are related to Pyroclastic?
Related terms in this reference are Tuff, Ignimbrite, Ash, Explosive eruption.

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