Tephrochronology is a geochronological technique that uses discrete layers of tephra—volcanic ash from a single eruption—to create a chronological framework in which paleoenvironmental or archaeological records can be placed. Such an established event provides a `tephra horizon`. The premise of the technique is that each volcanic event produ.....
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http://en.wikipedia.org/wiki/Tephrochronology
dating of volcanic eruptions by studying layers of ash
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http://phrontistery.info/t.html
method of age determination that makes use of layers of ash (tephra). Tephra layers are excellent time-stratigraphic markers, but, to establish a ... [2 related articles]
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http://www.britannica.com/eb/a-z/t/26
The collection, preparation, petrographic description, and approximate dating of tephra.
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http://www.encyclo.co.uk/local/21455
tephrochronology The dating of volcanic eruptions and other events by studying layers of tephra.
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http://www.wordinfo.info/words/index/info/view_unit/2111/
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