One method or relative dating
There are two main categories of dating methods in archaeology: indirect or relative dating and absolute dating.Relative dating includes methods that rely on the analysis of comparative data or the context (eg, geological, regional, cultural) in which the object one wishes to date is found.
Stratigraphy uses the assumption that higher layers or strata were laid down after lower layers.
Stratigraphy is based on the law of superposition--like a layer cake, the lowest layers must have been formed first.
In other words, artifacts found in the upper layers of a site will have been deposited more recently than those found in the lower layers.
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Archaeologists use many different techniques to determine the age of a particular artifact, site, or part of a site.
There are different ways that scientists can measure geological time.