However, this method is sometimes limited because the reoccupation of an area may require excavation to establish the foundation of a building, for instance, that goes through older layers.In this case, even if the foundation of the building is found in the same stratigraphic level as the previous occupation, the two events are not contemporary.Stratigraphic dating remains very reliable when it comes to dating objects or events in undisturbed stratigraphic levels.For example, the oldest human remains known to date in Canada, found at Gore Creek, have been dated using soil stratification.Indeed, some items whose exact or approximate age is known are called "diagnostic artifacts." Examples of such objects include very specific stone tools, different pottery styles, objects that belong to a specific period (eg, the historic period or the French regime), coins with a production date, or other items bearing a trademark and whose history can be traced in historical records.Their presence on archaeological sites is used to date the soil layers and the objects and events they are associated with and thus contributes to refine the chronology of sites.This approach helps to order events chronologically but it does not provide the absolute age of an object expressed in years.
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This article summarizes the principles of radiometric dating which are relevant to potassium–argon and argon–argon dating, and then considers these two forms of dating in more detail focusing on their strengths and weaknesses as dating methods.
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