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It is too soon to know whether the discovery will seriously upset the estimated dates of events like the arrival of human beings in the Western Hemisphere, scientists said.But it is already clear that the carbon method of dating will have to be recalibrated and corrected in some cases.Carbon dating is unreliable for objects older than about 30,000 years, but uranium-thorium dating may be possible for objects up to half a million years old, Dr. The method is less suitable, however, for land animals and plants than for marine organisms, because uranium is plentiful in sea water but less so in most soils.

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In some cases, the latter ratio appears to be a much more accurate gauge of age than the customary method of carbon dating, the scientists said.

In principle, any material of plant or animal origin, including textiles, wood, bones and leather, can be dated by its content of carbon 14, a radioactive form of carbon in the environment that is incorporated by all living things.

Because it is radioactive, carbon 14 steadily decays into other substances.

Since 1947, scientists have reckoned the ages of many old objects by measuring the amounts of radioactive carbon they contain.

New research shows, however, that some estimates based on carbon may have erred by thousands of years.

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  1. Surface exposure dating SED using in-situ produced cosmogenic nuclides TCN, especially 10Be and 26Al, has become an important dating method to improve our knowledge about the Last Glacial Maximum LGM and Deglaciation, as well as it has been applied for the dating of Early Holocene and Neoglacial Little Ice.

  2. Aug 26, 2008. Recent research in the mountains of the Mediterranean has attempted to establish the timing of the maximum extent of glaciers during the last cold stage. Several dating methods have been utilised and new dating frameworks have emerged in key areas. In several places, multiple dating techniques.

  3. The outermost moraines the most extensive Holocene advance in the Kurupa River. Valley and at Triple East glacier Fig. 1; Table 1 date to. 2.7 ± 0.2 and 4.6 ± 0.5 ka, respectively. 10Be dating of moraine boulders can provide an independent chronol- ogy, providing that certain conditions are met, but the method has yet.

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