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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.Other critics, perhaps more familiar with the data, question certain aspects of the quality of the fossil record and of its dating.

Mountains have been built and eroded, continents and oceans have moved great distances, and the Earth has fluctuated from being extremely cold and almost completely covered with ice to being very warm and ice-free.

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Among the best-known techniques are radiocarbon dating, potassium-argon dating and uranium-lead dating.

By allowing the establishment of geological timescales, it provides a significant source of information about the ages of fossils and the deduced rates of evolutionary change.

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Instead, other methods are used to work out a fossil’s age.

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