Difference between relative and chronometric absolute dating techniques
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An absolute age is one determined usually by mass-spectrometry where an isotope is measured and then an age can be calculated (a very very basic explanation).
So in the end you can say this fossil is 50 thousand years old (always with an associated uncertainty).
We have a long record of events in absolute time but much of that occurred before humans were on Earth to write it down.
So instead of human records, geologists use techniques such as radiometric dating.
Sometimes beds of rock can turn over the other way, so be very cautious when relatively dating rocks!