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Specimens of organic material which can yield good amount of carbon can be collected for C-14 dating.For example charcoal, wood, shell, paper, leaves, cloth, animal hair, bone, pollen, tooth, iron, prehistoric soot from the ceiling of the caves practically any material containing some carbon can be subjected Bones are generally affected by ground water carbonates and are therefore least reliable for dating.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.
Therefore as soon as the organism dies no further radiocarbon is added.
Astronomical data have been applied in the study of geological ice ages by calculating the curves for major fluctuation of solar radiation.
Consequently, the chronology worked out for the geological deposits helped in dating the prehistoric tools found in these deposits. There are certain antiquities and potteries which by themselves have acquired a dating value.
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.
However this formula has not been accepted by many archaeologists.