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Carbon-14 is a method used for young (less than 50,000 year old) sedimentary rocks.

This method relies on the uptake of a naturally occurring radioactive isotope of carbon, carbon-14 by all living things.

Radioactive elements are unstable; they breakdown spontaneously into more stable atoms over time, a process known as radioactive decay.

Radioactive decay occurs at a constant rate, specific to each radioactive isotope.

The decay series of most interest to geologists are those with half-lives of tens, hundreds or thousands of millions of years.

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All rocks and minerals contain tiny amounts of these radioactive elements.

A number of elements have isotopes (forms of the element that have different atomic masses) that are unstable and change by radioactive decay to the isotope of a different element.

Each radioactive decay series takes a characteristic length of time known as the radioactive half-life, which is the time taken for half of the original (parent) isotope to decay to the new (daughter) isotope.

There are two main methods determining a fossils age, relative dating and absolute dating.

Relative dating is used to determine a fossils approximate age by comparing it to similar rocks and fossils of known ages.

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