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geochronology |
Also found in: Dictionary/thesaurus, Wikipedia, Hutchinson | 0.06 sec. |
geochronologyDating 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. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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The second phase, started in 1998, consisted of extensive geological mapping, supplemented by U-Pb geochronological work; by 2003, more than twenty, 1:250,000 mapping projects were completed. Since the Clovis sites give the earliest unequivocal data on the "peopling" of the Americas, it has been of enormous interest to find a geochronological link to an earlier culture. Advances in analytical capabilities over the past 10-15 years allow geochronological studies to be carried out at a scale similar to petrological observation and within the realm of mineral processes. |
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