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Different methods have their own limitations, especially with regard to the age range they can measure and the substances they can date.
A common problem with any dating method is that a sample may be contaminated with older or younger material and give a false age.
You will find the essential part of the answer to your question in this "Socratic" link: What remains to be seen is: when should you use the one rather than the other.
Relative dating is useful during field work to measure, for instance, the throw of a fault, or to re-instate the missing part of a stratigraphic sequence.
Relative dating helps determine what came first and what followed, but doesn't help determine actual age.Instead, other methods are used to work out a fossil’s age.These include radiometric dating of volcanic layers above or below the fossils or by comparisons to similar rocks and fossils of known ages.Let's find out more about these geological dating methods in order to understand how Paul the Paleontologist can be so sure about the age of his dinosaur fossils.Geologists often need to know the age of material that they find.