Radioactive dating of rock layers

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radioactive dating of rock layers-76

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Relative dating is used to determine a fossils approximate age by comparing it to similar rocks and fossils of known ages.Radioactive elements decay at a certain constant rate and this is the basis of radiometric dating.But, the decay elements need to be set, much like you would re-set a stop watch for a runner, to ensure an accurate measurement.The Wheeler Formation has been previously dated to approximately 507 million year old, so we know the trilobite is also about 507 million years old.But, how can we determine how old a rock formation is, if it hasn’t previously been dated?

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