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...00 of the near-vent thickness was partially dictated by the fact that most tephra deposits are not well preserved at larger distances.<ref name="BonadonnaErn ...f the height of the [[eruption column]]. Later, a role for the size of the tephra and ash particles was identified,{{sfn|Pyle|1989|p=10}} with coarser fall d ...

...in-situ. Crystal separates involve either crushing a rock or sampling a [[tephra]] layer and then picking through the material to find the required mineral ...

...The technique is not restricted to tree rings; for example, a stratified [[tephra]] sequence in New Zealand, known to predate human colonization of the islan ...