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When museums and collectors purchase archaeological items for their collections they enter an expensive and potentially deceptive commercial fine arts arena.

Healthy profits are to be made from illicitly plundered ancient sites or selling skillfully made forgeries.

Each original isotope, called the parent, gradually decays to form a new isotope, called the daughter.

Each isotope is identified with what is called a ‘mass number’.

There is no particular reason to suspect that this will turn out to be the case when it comes to the laws underlying absolute dating; nonetheless, an argument from principle alone can never be entirely convincing. You will recall from our discussion of sea floor spreading that the sea floor spreads out from mid-ocean rifts, and so ought to be younger nearer the rifts and progressively older further away from them.

What is more, we can measure the rate of spreading directly by GPS, SLR, and VLBI.

We began our discussion of absolute dating by saying that sedimentation rates could not be relied on for absolute dating.

Scientists can use certain types of fossils referred to as index fossils to assist in relative dating via correlation.

Index fossils are fossils that are known to only occur within a very specific age range.

Using relative dating the fossil is compared to something for which an age is already known.

For example if you have a fossil trilobite and it was found in the Wheeler Formation.

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