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But, for a single culture site the method is quite reliable.

Quite convincing dates are sometimes arrived at by importing parallels from other contemporaneous cultures.

For example, if the cultural contents of the lower deposit are Mauryan in character, appropriately this deposit may be assigned a date between 400-200 B. Similarly, if the cultural equipment of the upper deposit are of the Sunga period, this deposit has to placed between 200-73 B. Quite often, the archaeologist decided the change of stratum on the basis of the feed of the deposit.

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.Some researchers have used the hydration rate of obsidian to acquire specific dates of the obsidian, which is based on the idea that a freshly broken obsidian surface begins to absorb water from its environment almost immediately.Absorption continues with time, generating a hydrated layer whose thickness is proportional to the time the glass surface was exposed this according to Anovitz et al (2006).This parallelism is formed due to trade relations, particularly wehen trade followed in both directions.For example, beads closely resembling those from the temple repositories at Cnoss and dating from C.1600 B.

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