Dating of fossils by scientists


16-Nov-2015 12:01

An object can be given an approximate date by dating the volcanic layers occurring above and below the object.Argon is gas that gradually builds up within rocks from the decay of radioactive potassium.

Only one sample is required for this method as both the argon-39 and argon-40 can be extracted from the same sample.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.Different methods have their own limitations, especially with regard to the age range they can measure and the substances they can date.The rates of absorption depend on a number of factors which are too variable to provide absolute dates.

This technique is, however, useful for providing relative dates for objects found at the same site.

Uranium is present in many different rocks and minerals, usually in the form of uranium-238.



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