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A coin, vessel, or other common artifact could link two archaeological sites, but the possibility of recycling would have to be considered.

It should be emphasized that linking sites together is essential if the nature of an ancient society is to be understood, as the information at a single location may be relatively insignificant by itself.

The stratigraphic column, a composite of these systems, was pieced together from exposures in different regions by application of the principles…

Local relationships on a single outcrop or archaeological site can often be interpreted to deduce the sequence in which the materials were assembled.

Without absolute ages, investigators could only determine which fossil organisms lived at the same time and the relative order of their appearance in the correlated sedimentary rock record.

When these regions are later exposed in uptilted portions of ancient continents, a history of terrestrial rock-forming events can be deduced.The same margin of error applies for younger fossiliferous rocks, making absolute dating comparable in precision to that attained using fossils.To achieve this precision, geochronologists have had to develop the ability to isolate certain high-quality minerals that can be shown to have remained closed to migration of the radioactive parent atoms they contain and the daughter atoms formed by radioactive decay over billions of years of geologic time.Similarly, in geology, if distinctive granitic pebbles can be found in the sediment beside a similar granitic body, it can be inferred that the granite, after cooling, had been uplifted and eroded and therefore was not injected into the adjacent rock sequence.Although with clever detective work many complex time sequences or relative ages can be deduced, the ability to show that objects at two separated sites were formed at the same time requires additional information.

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