Sadly, this hybrid, high jacked and half-baked Settled Science has now degenerated into a recursive [incestuous] feedback loop where dendrochronology calibrates Radiocarbon Dating which, in its turn, is used to calibrate dendrochronology.
See: https://malagabay.wordpress.com/2014/05/16/carbon-14-libbys-ring/ Amongst the many issues associated with the Settled Science of radiocarbon dating there is the curious case of Catastrophic Cometary Carbon-14.
This millions of years time scale is based on radiometric dating of fossil-bearing layers of rock.
This teaching of long ages for life on earth has led some Christians to question and even abandon their belief in the Bible, since a literal reading of Scripture is not consistent with the belief that life has existed on earth for millions of years.
This makes radiocarbon dating quite useful, up to a point.
In fact, I believe that the question of how long life has existed on earth is even more important than the question of whether life was created or evolved.
Arguably, the burning up of a cometary debris train in the Earth’s atmosphere would significantly enhance the level of atmospheric Carbon-14.
Carbon-14 is produced in the upper layers of the troposphere and the stratosphere by thermal neutrons absorbed by nitrogen atoms.
"Everything that has come down to us from heathendom is wrapped in a thick fog; it belongs to a space of time that we cannot measure.
We know that it is older than Christendom, but whether by a couple of years or a couple of centuries, or even by more than a millennium we can do no more than guess"  Many of us are intimidated by science.