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14-Aug-2020 16:59
This problem is now reduced by the careful collection of samples, rigorous crosschecking and the use of newer techniques that can date minute samples.Volcanic rocks – such as tuff and basalt – can be used in dating because they are formed at a particular moment in time, during an eruption.This damage is in the form of tiny marks called fission tracks.When volcanic rocks and minerals are formed, they do not contain fission tracks.
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These include radiometric dating of volcanic layers above or below the fossils or by comparisons to similar rocks and fossils of known ages.Where the rocks are not strongly folded or tilted it is possible to work out the order in which the layers were formed.The oldest rocks and fossils are at the bottom and the youngest are on top.Only one sample is required for this method as both the argon-39 and argon-40 can be extracted from the same sample.
In special cases, bones can be compared by measuring chemicals within them.This technique is, however, useful for providing relative dates for objects found at the same site.Another useful chemical analysis technique involves calculating the amount of nitrogen within a bone.The heat from a volcanic eruption releases all the argon from the molten rock and disperses it into the atmosphere.
