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tephrochronology

[tef-roh-kruh-nol-uh-jee]
noun Geology.
  1. a geochronologic technique based on the dating of layers of volcanic ash.
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Compare tephra.

Origin of tephrochronology

1940–45; < Swedish tefrokronologi, equivalent to tefr(a) volcanic ejecta (< Greek téphra ash) + -o- -o- + kronologi chronology
Related formsteph·ro·chron·o·log·i·cal [tef-roh-kron-l-oj-i-kuh l] /ˌtɛf roʊˌkrɒn lˈɒdʒ ɪ kəl/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018