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radiometric dating

 

Animals then eat the plants, by which c-14 is integrated into their body. Carbon-14 is a radioactive isotope of carbon, with a half-life of 5,730 years, which is very short compared with the above isotopes and decays into nitrogen. The samples dated from half a million years ago to almost 3 million years ago.

For organic materials, the comparison is between the current ratio of a radioactive isotope to a stable isotope of the same element and the known ratio of the two isotopes in living organisms. For example, although most rocks contain significant amounts of Calcium, the isotope Calcium-41 half-life 130,000 years does not exist just as potassium-38, -42, -43, etc.

Translation - If the axis of the earth were vertical in the past, there would have been no seasons at all, and the apparent years could have been caused by any number of factors.

radiometric dating