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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.Ice core sampling normally uses the assumption that the ring bands observed represents years.One known example where this assumption was used is very misleading.It only sequences the age of things or determines if something is older or younger than other things.

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The majority of the time fossils are dated using relative dating techniques.

Since relative dating can easily be verified by superposition (the younger bed over the older one), intrusion (the intrusive being younger than the intrusive rock), and use of index fossils (younger fossils in a rock layer make that layer younger than another containing older fossils), relative dating can be confirmed right at the field using one's direct observation.

It could also be immediately confirmed in the base office once maps and cross sections are updated and the rock units confirmed.

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.