Carbon dating if world was surrounded by water

Direct dating of the rice remains might serve to clarify their age.Here, we first validate the reliability of phytolith dating in the study region through a comparison with dates obtained from other material from the same layer or context.One good example is granite, which normally has some potassium feldspar (Figure 8.15).

Isotopic dating of rocks, or the minerals in them, is based on the fact that we know the decay rates of certain unstable isotopes of elements and that these rates have been constant over geological time.Some of the other important pairs are listed in Table 8.2, along with the age ranges that they apply to and some comments on their applications.When radiometric techniques are applied to metamorphic rocks, the results normally tell us the date of metamorphism, not the date when the parent rock formed.Our phytolith data indicate that rice remains retrieved from early stages of the Shangshan and Hehuashan sites have ages of approximately 9,400 and 9,000 calibrated years before the present, respectively.The morphology of rice bulliform phytoliths indicates they are closer to modern domesticated species than to wild species, suggesting that rice domestication may have begun at Shangshan during the beginning of the Holocene.

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