Tephrochronology

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What Wikipedia says

Tephrochronology is a geochronological technique for dating archaeological, geological and palaeoenvironmental sequences and events by their location between upper and lower layers of tephra (volcanic ejecta) of known date, and for correlating such sequences and events at separate locations between the same layers.

Excerpt from the Wikipedia article “Tephrochronology”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Dentren, GFDL, via Wikimedia Commons.