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We can assume that the Precambrian rocks already existed when life began, and so the ages of the Precambrian rocks are not necessarily related to the question of how long life has existed on earth.

The Cambrian period is conventionally assumed to have begun about 550 million years ago.

Since there doesn't seem to be any systematic error that could cause so many methods to agree with each other so often, it seems that there is no other rational conclusion than to accept these dates as accurate.

However, this causes a problem for those who believe based on the Bible that life has only existed on the earth for a few thousand years, since fossils are found in rocks that are dated to be over 500 million years old by radiometric methods, and some fossils are found in rocks that are dated to be billions of years old.

When one considers the power of God, one sees that any such conclusions are to some extent tentative. Some fossils are found in Precambrian rocks, but most of them are found in Cambrian and later periods.The radioactive disequilibrium is one of the most complex and important issue in calculating the ESR ages. 2.1 where the age, T, is obtained as the solution of, Eq.2.4, as these procedures are actually adopted in obtaining the ESR ages of hydrothermal barite in Okinawa Trough (Fujiwara Ra and its daughter nuclei are not observed would not necessarily guarantee that their contribution is negligible.On the surface, radiometric dating methods appear to give powerful support to the statement that life has existed on the earth for hundreds of millions, even billions, of years.We are told that these methods are accurate to a few percent, and that there are many different methods.

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Back to top Radioactive elements decay gradually into other elements.

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