tephrochronological /tef'roh kron'l oj"i keuhl/, adj.
/tef'roh kreuh nol"euh jee/, n. Geol.
a geochronologic technique based on the dating of layers of volcanic ash. Cf. tephra.
[1940-45; < Sw tefrokronologi, equiv. to tefr(a) volcanic ejecta ( < Gk téphra ash) + -o- -O- + kronologi CHRONOLOGY]

Useful english dictionary. 2012.

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