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Geological strata dating

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The study of stratified rocks is known as stratigraphy. It is a branch of geology that deals with the correlation, interpretation, and description of stratified sediments and rocks that are found on or below the surface of the earth. Stratigraphy is a science that primarily deals with the study of layered sedimentary rocks called strata but may also include layered igneous rocks. Layered rocks may result from successive lava flows or from the formation of extrusive igneous rocks. Stratigraphy is an important field of modern archaeology. Since stratigraphy establishes that sedimentation occurs according to uniform principles, it is easier for archaeologists to draw up conclusions.
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Quick Answer: How can relative dating be used in geology?

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How does relative and absolute dating were used to determine the subdivisions of geologic time?

Geologists often need to know the age of material that they find. They use absolute dating methods, sometimes called numerical dating , to give rocks an actual date , or date range, in number of years. This is different to relative dating , which only puts geological events in time order. Scientists use the geologic time scale to illustrate the order in which events on Earth have happened. Later, scientists used absolute dating to determine the actual number of years ago that events happened.
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Stratigraphic Superposition

It is not about the theory behind radiometric dating methods, it is about their application , and it therefore assumes the reader has some familiarity with the technique already refer to "Other Sources" for more information. 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. A common form of criticism is to cite geologically complicated situations where the application of radiometric dating is very challenging. These are often characterised as the norm, rather than the exception.
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This makes geology partially philosophical science since we never know the extent and real dimension of time. In this case our own place in time is just a flick among series of evolutionary events. However, as humans we are always ready to place ourselves as central or influential figures. Then we get a slap in the face from Mother Nature, but unfortunately we never learn. Geologists analyze geologic time in two different ways: in terms of relative geologic age , and in terms of absolute or numeric geologic age.
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