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Posted by / 23-Sep-2017 06:32

Numerical age or relative dating

Essentially, relative dating places rocks in their proper sequence of formation, e.g. Although relative dating cannot give us numeric dates for events that took place, it does provide useful information on what event followed or preceded another event.

Relative dating is still very valuable to scientists and still widely used.

his document discusses the way radiometric dating and stratigraphic principles are used to establish the conventional geological time scale.

It is not about the theory behind radiometric dating methods, it is about their , and it therefore assumes the reader has some familiarity with the technique already (refer to "Other Sources" for more information).

However, prior to the discovery of radioactivity, geologists had no proven method of numerical dating and instead had to rely solely on relative dating.When the age is determined in this manner, it is called the absolute age, from absolute dating techniques.For a determination in the field, geologists attempt to date a rock or fossil based on its relative age, which is usually determined by the presence of a trace fossil, or the position of the rock layer in relation to a layer of rock with a known age.As an example of how they are used, radiometric dates from geologically simple, fossiliferous Cretaceous rocks in western North America are compared to the geological time scale.To get to that point, there is also a historical discussion and description of non-radiometric dating methods.

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For example, the extinction of the dinosaurs about 65 million years ago.

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