Carbon dating live mollusk
When the plant or animal that consumed the foliage dies, it stops exchanging carbon with the environment and from there on in it is simply a case of measuring how much carbon 14 has been emitted, giving its age.
But new research conducted by Cornell University could be about to throw the field of archaeology on its head with the claim that there could be a number of inaccuracies in commonly accepted carbon dating standards.
The level of C-14 in mollusk shells reflects their source of carbonate.
Creationists assume, usually on the basis of a "flood" argument, that there have been large changes in the amount of carbon dioxide in the atmosphere during the past several thousand years.
Creationists attack all radioactive dating with the claim that radioactive decay rates may have been different in the past.
There is absolutely no valid evidence to support this claim.
The creationist argument that the ratio of C-14 to C-12 is not constant is actually based on the assumption of a young earth with an age of 10,000 years, and sudden changes in the amount of carbon dioxide in the atmosphere caused by the assumed catastrophic events of the Genesis flood.
This is the motivation behind the 30,000 year figure quoted in the creationist position.
It can either be present as stable carbon 12 or unstable carbon 14.
To test this oversight, the researchers measured a series of carbon 14 ages in southern Jordan tree rings calculated as being from between 16.
Sure enough, it showed that plant material in the southern Levant showed an average carbon offset of about 19 years compared with the current northern hemisphere standard calibration curve.
Trees and plants that get their carbon from the carbon dioxide of the atmosphere will, while they are living have a percentage of carbon 14 equal to that in the atmosphere.
The same is true of animals that eat plant material.