Age of fossils in the past was generally determined by radio-carbon method and other methods involving radioactive elements found in the rocks. More precise methods, which were used recently and led to the revision of the evolutionary periods for different groups of organisms, includes

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electron spin resonance (ESR) and fossil DNA. Electron spin resonance can date mineral defects formed over time, and fossil DNA provides molecular evidence that helps revise evolutionary timelines. These newer approaches are more precise than older broad radioactive dating methods for some fossils.

Age of fossils in the past was generally determined by radio-carbon method and other methods involving radioactive elements found in the rocks. More precise methods, which were used recently and led to the revision of the evolutionary periods for different groups of organisms, includes

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