The types and forms or shape of these pots and also the antiquities under go evolutionary changes in cource of time, It is further assumed that all living animals derive body material from the plant kingdom, and also exhibit the same proportion of C-14 material.
But, for a single culture site the method is quite reliable.
Whenever and where ever such antiquities are found, associated finds are automatically dated.
For example Mauryan terracottas, Roman amphorae, Harappan pottery, NBP , PGW,etc.
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.