Objects having similar features are classified under one category.
Likewise, dissimilar objects are classified under another.
Layers get deposited above one another, over time, and fossils get trapped in these layers.
Dating methods are classified into relative and absolute dating.
Relative dating is a science which deals with the comparative study of events from the past.
The term used for the relative dating technique in archeology is 'Typology'.
This method is mainly used for dating the sites and objects which have archeological importance.
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In stratigraphic relative dating, the succession of layers can be seen as the timeline of its formation or deposition.