Examples of ignimbrite

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The presence of banded pumice near the top defines a compositional zonation of the ignimbrite.
The rhyolite has the form of a variably welded and massive, crystal-rich ignimbrite and associated non-welded pyroclastic deposits.
The individual ignimbrite sequences are up to 200 m thick.
Where the ignimbrite is not welded it varies from white to orange, possibly thermal, colouration.
This is overlain by a thin lenticular ignimbrite flow-unit draped by a fine ash layer, and buried by thick massive lapilli-tuff.
In each formation, the ignimbrite veneers locally grade laterally into more restricted valley-fills (predominantly of pumiceous massive lapilli-tuff facies) within small palaeo-wadis.
The formation is vertically zoned with the appearance of banded and mafic pumices approximately 8 cm above the base of the ignimbrite.
Widely dispersed plinian-type pumice fall deposits and ignimbrite are characteristic products of both explosive cycles.
These larger volume eruptions are dominated by ignimbrite.
The syn-rift sediments were sealed by a regionally correlated ignimbrite that in turn was offset by late second-phase faulting.
The ignimbrite has a simple sheet-like geometry, but exhibits a complex internal stratigraphy.
The base of the ignimbrite is commonly fine-grained and stratified, and grades upwards into massive ignimbrite.
Concentrations of pumice occur locally in the upper 20-30 cm of the ignimbrite.
Elsewhere, mudstone contains poorly preserved isolated plant remains, and ignimbrite and lava flow tops can include some quite sizeable wood debris.
A huge range of lithologies is described and their formation explained: peperite, breccia, agglomerate, ignimbrite, to name but four.
The alkali basalt lithic breccias pass abruptly upwards into banded pumice-bearing ignimbrite.
A pink, beige weathering welded rhyolitic ignimbrite forms a conspicuous cap on many hills of the area.

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