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This method relies on the uptake of a naturally occurring radioactive isotope of carbon, carbon-14 by all living things.

Radioactive elements decay at a certain constant rate and this is the basis of radiometric dating.

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When minerals get subducted into the Earth and come back as volcanic magmas or ash, this essential re-sets the radiometric clock back to zero and therefore a reliable age date is possible.All rocks and minerals contain tiny amounts of these radioactive elements.Radioactive elements are unstable; they breakdown spontaneously into more stable atoms over time, a process known as radioactive decay.Sedimentary rocks may have radioactive elements in them, but they have been re-worked from other rocks, so essentially, there radiometric clock has not been re-set back to zero.However, sedimentary rocks can be age dated if a volcanic ash horizon or a diabase sill or dyke can be found within the sequence.




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