Methods of dating trees
In such cases subjective element cannot be ruled out.
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.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.Whenever and where ever such antiquities are found, associated finds are automatically dated.For example Mauryan terracottas, Roman amphorae, Harappan pottery, NBP , PGW,etc.At that time the radioactive disintegration takes over in an uncompensated manner. only half the C-14 will remain after the half-life period.
In the disintegration process the Carbon-14 returns to nitrogen emitting a beta particle in the process.
Antiquities and potteries of Roman origin were found in association with the finds of Indian origin.
With the aid of these dated imports it was possible to date the associated Indian objects to the first two centuries A. Similarly NBP and PGW has helped in fixing the chronology of numerous sites. Sometimes dates are also obtained with the assistance of astronomy.
Clay tablets found in West Asia contain inscriptional evidence with regard to the occurrence of a solar eclipse.
Specialists in the field of astronomical research placed this solar eclipse as on 15 June 763 B. The Almanac belonging to Maya culture of Central America helped in dating several important sites accurately on the basis of astronomy.
The deposit thus occurring forms layers depending on the nature of the material brought in by the people inhabiting the area.