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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.

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.

Between the years of 17, James Hutton and William Smith advanced the concept of relative dating.

Hutton, a Scottish geologist, first proposed formally the fundamental principle used to classify rocks according to their relative ages.

Accurate dates also allow us to create sequences of evolutionary change and work out when species appeared or became extinct. These are: Where possible, several different methods are used and each method is repeated to confirm the results obtained and improve accuracy.This approach helps to order events chronologically but it does not provide the absolute age of an object expressed in years.Relative dating includes different techniques, but the most commonly used are soil stratigraphy analysis and typology.On the other hand, absolute dating includes all methods that provide figures about the real estimated age of archaeological objects or occupations.These methods usually analyze physicochemical transformation phenomena whose rate are known or can be estimated relatively well.

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That way, regardless of where they trained or where they practice, any two doctors dating a pregnancy will predict the same due date or gestational age.