Quite convincing dates are sometimes arrived at by importing parallels from other contemporaneous cultures.
This parallelism is formed due to trade relations, particularly wehen trade followed in both directions.
The quantity of the C-14 remaining is measured by counting the beta radiation emitted per minute per gram of material.
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Even when the absolute dates are available, we have to supplement the information with relative dating.
The various methods of relative dating are; This method depends on the common observation that the height of the habitational area increases as the people continue to live at the same place.
In such cases subjective element cannot be ruled out.
But, for a single culture site the method is quite reliable.
Once a type has been classified by the aid of its context further specimen of the same type, even when found in isolation, can be assigned their place in terms of dates.
Association in simplicity can be illustrated by an example, at the port of Arikamedu near Pondicherry.
This dating method is also known as Archaeological Dating or Historical Chronology. These methods were relied on especially prior to the introduction of scientific methods of dating.
But, even when the scientific methods of absolute dating are available, this method of dating has not lost its importance, as many a time we have to depend solely on relative dating.
Charred bones are better preserved and are therefore relatively more reliable.
Charcoal is best material specially if derived from short live plants.
Specimens of organic material which can yield good amount of carbon can be collected for C-14 dating.