geochronology


geo·chro·nol·o·gy

noun \-krə-ˈnä-lə-jē\

Definition of GEOCHRONOLOGY

1
:  the chronology of the past as indicated by geologic data
2
:  the study of geochronology
geo·chro·no·log·i·cal \-ˌkrä-nə-ˈlä-ji-kəl, -ˌkrō-\ also geo·chro·no·log·ic \-ˈä-jik\ adjective
geo·chro·no·log·i·cal·ly \-ji-k(ə-)lē\ adverb
geo·chro·nol·o·gist \-krə-ˈnä-lə-jist\ noun

First Known Use of GEOCHRONOLOGY

1893

geochronology

noun    (Concise Encyclopedia)

Dating and interpretation of geologic events in the history of the Earth. The classical technique of geochronology was stratigraphy, including faunal succession. Since the mid 20th century, radiometric dating has provided absolute age data to supplement the relative dates obtained from the fossil record. Radiometric dating is based on the principle that radioactive isotopes in geologic material decay at constant, known rates to daughter isotopes. See also carbon-14 dating.

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