Relitive dating

Stratigraphy uses the assumption that higher layers or strata were laid down after lower layers.Ice core sampling normally uses the assumption that the ring bands observed represents years.However, the assumption of contemporaneity may not always be correct.This is due to the fact that one or both of the objects may have been moved or redeposited into a different location...radiometric methods of dating rocks, the ages of rocks and other geologic features could not be expressed quantitatively, or as numbers of years, but instead were expressed solely in terms of relative ages, in which the age of a particular geologic feature could be expressed as relatively younger or older than other geologic features. Local relationships on a single outcrop or archaeological site can often be interpreted to deduce the sequence in which the materials were assembled.

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In many cases, however, it is possible to reconstruct the original sequence of strata so that they can be used for relative dating.Some types of relative dating techniques include climate chronology, dendrochronology, ice core sampling, stratigraphy, and seriation.Seriation uses the assumption that once a tool was developed, its use would become more widespread.Sediments are usually laid down in horizontal beds.Any observable tilting or swirling is due to disruption of the process. Material that intrudes or cuts into a horizontal bed is assumed to be younger than the material that is disrupted.For example, archaeologists might date materials based upon relative depth of burial in a site.


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