tuff deposit

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• Tuff — (from the Italian tufo ) is a type of rock consisting of consolidated volcanic ash ejected from vents during a volcanic eruption. Tuff should not be confused with tufa , another type of rock. Volcanic ashThe products of a volcanic eruption are… …   Wikipedia

• tuff —    A generic term for any consolidated or cemented deposit that is . 50 percent volcanic ash (< 2 mm); various types of tuff can be recognized based on composition: acidic tuff is predominantly composed of acidic particles; basic tuff is… …   Glossary of landform and geologic terms

• TUFF —    The technical term for the consolidated ash deposits of volcanic origin that make up much of the landscape of South Etruria. The Italian terms tufo or tufa are sometimes employed colloquially in English, but can be confused with the technical… …   Historical Dictionary of the Etruscans

• welded tuff — noun : a tuff deposit sufficiently thick and hot at the time of emplacement that the fragments soften and coalesce to form a rock which simulates rhyolite or obsidian * * * Petrol. ignimbrite …   Useful english dictionary

• Pantelleria —   Comune   Comune di Pantelleria Panorama …   Wikipedia

• Ignimbrite — is a volcanic pyroclastic rock, often of dacitic or rhyolitic composition. Ignimbrite is the deposit of a pumice rich pyroclastic density current, or pyroclastic flow , a hot suspension of particles and gases that flows rapidly from a volcano,… …   Wikipedia

• Phreatomagmatic eruption — Phreatomagmatic eruptions are defined as juvenile forming eruptions as a result of interaction between water and magma. They are different from magmatic and phreatic eruptions. The products of phreatomagmatic eruptions contain juvenile clasts,… …   Wikipedia

• Geology of the Australian Capital Territory — Australia grew around three fused pieces of very ancient continental crust (cratons). The geology of the Australian Capital Territory includes rocks dating from the Ordovician around 480 million years ago, whilst most rocks are from the Silurian …   Wikipedia

• Mount Pleasant Caldera — Elevation approx. 248 m (814 ft) Listing List of volcanoes in Canada …   Wikipedia

• Geology of Jersey — The geology of Jersey is characterised by the Late Proterozoic Brioverian volcanics, the Cadomian Orogeny, and only small signs of later deposits from the Cambrian and Quaternary periods. The kind of rocks go from conglomerate to shale, volcanic …   Wikipedia

• Mount Meager — The Mount Meager volcanic complex rising above the Pemberton Valley. Summits left to right are Capricorn Mountain, Mount Meager proper and Plinth Peak …   Wikipedia