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Examples
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For older sediments, techniques include tephrochronology (involving potassium) and magnetostratigraphy (involving iron).
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In tephrochronology, layers of volcanic ash, tephra, often contain potassium-bearing minerals whose crystallization age can be determined, even going back billions of years.
colleen commented on the word tephrochronology
The dating of volcanic eruptions and other events by studying layers of tephra. (OED)
March 11, 2007