welded (ash hot enough to be welded together) and non-welded (air fall) tuffs from a nuee ardente.
the rock formed by the widespread deposition and consolidation of volcanic ash flows and nuee ardentes . The term includes welded tuff (recrystal-lized ash flows) and volcanic breccias.
A pumice-rich deposit formed by a pyroclastic flow.
a poorly-sorted pyroclastic rock body formed by deposition from a flow of pumice
tuff whose acidic lava fragments are welded by consolidation of ash flows.
A volcanic deposit formed by a pyroclastic flow. Ignimbrite layers can be soft and full of pumice such as the land surface around Taupo (from the Taupo eruption 1800 years ago); or hard rock where the deposit has been thick and hot enough for the particles to fuse together (eg at Bulli and Te Toki Points on Lake Taupo).
A type of rock which forms from hot pyroclastic ash clouds developed during explosive volcanic eruptions;
A rock created by the welding together of ash and other volcanic material.
Ignimbrite is a volcanic pyroclastic rock, often of dacitic or rhyolitic composition.