Fossil dating radioactive decay

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So, we have a “clock” which starts ticking the moment something dies.Obviously, this works only for things which were once living.

A stronger magnetic field deflects more cosmic rays away from the Earth.It cannot be used to date volcanic rocks, for example.The rate of decay of N in 5,730 years (plus or minus 40 years).These techniques, unlike carbon dating, mostly use the relative concentrations of parent and daughter products in radioactive decay chains.For example, potassium-40 decays to argon-40; uranium-238 decays to lead-206 via other elements like radium; uranium-235 decays to lead-207; rubidium-87 decays to strontium-87; etc.

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