ignimbrite

This can lead to the production of a rock called ignimbrite.

On the top and western sides is a rock called ignimbrite.

It has been filled several times by ignimbrite since then, and the process repeated itself, most recently 21,000 years ago.

Valleys were filled with ignimbrite, evening out the shape of the land.

The volcano is composed of ignimbrite, which has formed a shield.

Rock types are made up of phonolite and ignimbrite.

Named descriptively from the red-colored ignimbrite rock of this feature.

During this eruption at least 120 square kilometers were covered in a dacitic ignimbrite.

It overlies a plateau which is composed of ignimbrite.

At this time, the Mamaku ignimbrite, covering about 4000 square km, was deposited.

Ash, volcanic bombs, and ignimbrite are all treated alike.

Seldom can gneiss, granite and ignimbrite have found so enthusiastic an expositor.

Branney et al. 2002 suggest that as an ignimbrite is a deposit, its characteristics cannot completely represent the flow.

Events here may relate to the ignimbrite flare-up of the southern Basin and Range.

The lower, welded layers of the ignimbrite sheets are more dense, though still porous.

The earliest eruptions of the volcano occurred around one million years ago, explosive activity producing ignimbrite.

Tephra from the eruption covered much of the central North Island with ignimbrite up to 200 metres deep.

An ignimbrite is the deposit of a pyroclastic density current, or pyroclastic flow.

The mineralogy of an ignimbrite is controlled primarily by the chemistry of the source magma.

There is anchorage at Down Rope and ignimbrite is also found in the vicinity.

Examples of pyroclastic rocks are tuff and ignimbrite.

These were of rock types including basalt, andesite, ignimbrite and sedimentary rock.

The frequent association of massive quantities of ignimbrite with large calderas suggests a genetic link.

This hosts Masaya caldera, formed 2500 years ago by an 8-km3 basaltic ignimbrite eruption.

The volcanic rock Ignimbrite which formed the cliffs was deposited in the Triassic period about 220 million years ago.