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Outside the range of recorded history, calibration of the 14 clock is not possible.
This means the above calculations are only evolution speculation and NOT backed up by real science.
When granite rock hardens, it freezes radioactive elements in place.
The most common radioactive element in granite is Uranium-238.
They have masses of 13 and 14 respectively and are referred to as "carbon-13" and "carbon-14." If two atoms have equal numbers of protons but differing numbers of neutrons, one is said to be an "isotope" of the other.
Carbon-13 and carbon-14 are thus isotopes of carbon-12.
In the case of radiocarbon dating, the half-life of carbon 14 is 5,730 years.
When isotopes are to be designated specifically, the chemical symbol is expanded to identify the mass (for example, C is not stable.He was considered to be the brutish ancestor link to man in the evolution chain, the intermediate stage between man and ape.