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Palaeontology - Palaeontology, the study of fossilised remains of bones in archaeological sites also provide relative dates.The method is based on the fact that some animals migrate or become extinct with the change of climate.
While the excavation of grave was carried out in Egypt, Petrie found that the graves were associated with varied pottery.
He analyse the features of pottery such as handles of pot and worked out a sequence showing their change, progressing from functional entities to mere decorations.
According to Wheeler 'the values of typological classification are liable to be local rather than universal' but when the method is used in corroboration with stratigraphic method, it may become very helpful'.
The method is based on the fact that artefacts change in predictable ways through time.
Fluorine, Uranium, and Nitrogen analysis: Prehistoric sites often consist of many bone remains.
The basic principle of the method is that the longer a bone will be placed in soil, the more fluorine will be caught in and hence can suggest a relative date.
Since fluorine and uranium levels in the bone increase with time, while nitrogen decreases, such measurements helps to place in sequence the cultural phases with which the different bones may be associated.
In fact the analysis of fluorine, uranium or nitrogen is regarded as one of the very important technique for relative dating.
All bones whether of animal or of human lying in the same level exhibit similar fluorine percentage in them.