If a rock was shot from a volcano and isn't that old, can we use radiocarbon dating.
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Samples of rock are not able to be dated using radiocarbon, because rocks contain no organic carbon from living organisms that are of recent enough age. Radiocarbon dating is limited to the period 0 - 60 years, because the 'half-life' of radiocarbon is about years, so to date rocks scientists must use other methods.
We can date volcanic rocks using a method called argon-argon dating for instance.
The only way to date a volcanic ash layer using radiocarbon dating is to find ash within a lake sediment or peat layer and then date the organic carbon from above and below it, and therefore fix an age for the ash event.