Examples of tephra

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A peat monolith was extracted and seen to contain three tephra layers.
In addition to providing chronological controls to date environmental change, tephra may also act as agents of environmental change.
On the damage caused by volcanic eruptions with special reference to tephra and gases.
In these cases, tephra may provide abrupt environmental 'shocks' that can be used to assess sensitivity and robustness within environmental and cultural systems.
Numerous explosive eruptions producing tephra and ignimbrites were generated in the last 13 000 years.
This possibly contributed to the alteration of the tephra deposits but such effects are usually elementspecific.
In principle, several effects could have influenced and changed the original chemical composition of tephra deposits.
An individual tephra layer can be used to define a precise spatial reconstruction of an environment at what is effectively a moment in time.
Vegetation should not be harmed by a porous tephra ground layer, which might also have facilitated drainage.
Samples were collected from tephra layers, and if available, from lava flows as well.
A distinct change in the pollen assemblage occurs coincident with the tephra horizon (or becomes evident immediately above it).
If ashfall, or the human fear of the consequences of tephra falls, affected grazing, this may have led to abandonment of the land.
However, from the farmers' point of view, tephra deposition in this order of magnitude was not detrimental to their livelihood, as fluorosis was not mentioned as a hazard to livestock.
The presence of a mixture of euhedral and oval zircon grains in the host mudstone is taken to represent an input of both clastic material and re-worked tephra.

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