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Rocks of Precambrian age had only the rarest wisps of fossils.In a related article on geologic ages (Ages), we presented a chart with the various geologic eras and their ages.The results showed that Ötzi died over 5000 years ago, sometime between 33 BC. Uranium has a very long half-life and so by measuring how much uranium is left in a rock its approximate age can be worked out. The work of geologists is to tell the true story of Earth's history—more precisely, a story of Earth's history that is ever more true.This chain eventually ends with the formation of a stable, nonradioactive daughter nuclide.Each step in such a chain is characterized by a distinct half-life.It is the principal source of information about the absolute age of rocks and other geological features, including the age of the Earth itself, and it can be used to date a wide range of natural and man-made materials.The best-known radiometric dating techniques include radiocarbon dating, potassium-argon dating, and uranium-lead dating.

The different methods of radiometric dating are accurate over different timescales, and they are useful for different materials.

For more than a hundred years the best method of arranging its history was the use of fossils or biostratigraphy.

That only worked for sedimentary rocks, and only some of those.

For example, in 1991, two hikers discovered a mummified man, preserved for centuries in the ice on an alpine mountain.

Later called Ötzi the Iceman, small samples from his body were carbon dated by scientists.

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