Fossil dating accuracy

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Click to see full answer In this regard, how do paleoanthropologists determine how old a fossil is? Relative dating is used to determine a fossils approximate age by comparing it to similar rocks and fossils of known ages. Absolute dating is used to determine a precise age of a fossil by using radiometric dating to measure the decay of isotopes, either within the fossil or more often the rocks associated with it. One may also ask, how do we date things millions of years old? Today's knowledge of fossil ages comes primarily from radiometric dating, also known as radioactive dating.
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DK Science: Dating Fossils

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Molecular clock - Wikipedia

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18.5D: Carbon Dating and Estimating Fossil Age

Since , scientists have reckoned the ages of many old objects by measuring the amounts of radioactive carbon they contain. New research shows, however, that some estimates based on carbon may have erred by thousands of years. It is too soon to know whether the discovery will seriously upset the estimated dates of events like the arrival of human beings in the Western Hemisphere, scientists said.
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The molecular clock is a figurative term for a technique that uses the mutation rate of biomolecules to deduce the time in prehistory when two or more life forms diverged. The biomolecular data used for such calculations are usually nucleotide sequences for DNA , RNA , or amino acid sequences for proteins. The benchmarks for determining the mutation rate are often fossil or archaeological dates.
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