How are fossils dated using relative dating

Far from being data, these dates are actually interpretations of the data.

Certain types of rocks, especially those that form from magma (igneous), contain radioactive isotopes of different elements.Relative ages are assigned to rocks based on the idea that rock layers lower in the strata were deposited before rock layers that are higher.Creationists do not necessarily disagree with this concept, but it can only be applied to layers that are found in one location and/or can be determined to have been deposited in a continuous layer over a very wide area.The reason this age may not be a true age—even though it is commonly called an absolute age—is that it is based on several crucial assumptions.Most radiometric dating techniques must make three assumptions: The major problem with the first assumption is that there is no way to prove that the decay rate was not different at some point in the past.

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