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tephrochronology

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Examples

  • For older sediments, techniques include tephrochronology (involving potassium) and magnetostratigraphy (involving iron).

    NYT > Home Page

  • In tephrochronology, layers of volcanic ash, tephra, often contain potassium-bearing minerals whose crystallization age can be determined, even going back billions of years.

    NYT > Home Page

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  • The dating of volcanic eruptions and other events by studying layers of tephra. (OED)

    March 11, 2007