Addition to the above assumptions, dating methods are all subject to the geologic column date to verify their accuracy.
One is for potentially dating fossils (once-living things) using carbon-14 dating, and the other is for dating rocks and the age of the earth using uranium, potassium and other radioactive atoms.
How far back can radiocarbon dating accurately date a fossil
Levels of carbon-14 in the atmosphere vary from year to year, so scientists need to calibrate their estimates using long-running records of radiocarbon levels.
Snelling, geological conflict: young radiocarbon date for ancient fossil wood challenges fossil dating, creation ex nihilo 22(2):4447, 2000.
How far can radiocarbon dating go back
Note that, contrary to a popular misconception, carbon dating is not used to date rocks at millions of years old.
We get into the details of how radiometric dating methods are used, we need to review some preliminary concepts from chemistry.
The c-14 in the plant or animal will begin to decay back to normal nitrogen.
Snelling, stumping old-age dogma: radiocarbon in an ancient fossil tree stump casts doubt on traditional rock/fossil dating, creation ex nihilo 20(4):4851, 1998.
Dating relies on a naturally-occurring radioactive isotope of carbon called carbon-14, which is formed in the atmosphere and taken up by plants.
This is why most people say carbon dating is only good for objects less than 40,000 years old.
If a date obtained by radiometric dating does not match the assumed age from the geologic column, the radiometric date will be rejected.
It extends over virtually the entire timespan for which carbon-dating is usedas far back as 60,000 years or so, when the the carbon-14 in the sample has decayed to unreliable levels.
Of the many fallacious assumptions used in the dating process, many people believe Carbon-14 dating disproves the biblical timeline.
This technique looks good at first, carbon-14 dating rests on at least two simple assumptions.