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How Do Paleontologists Date Fossils? - Secrets of the Underground
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Both plants and animals exchange carbon with their environment until they die. A very selective history of life on Earth over the past million years is provided in Figure 8. All rights reserved. This happens at known rates. Measuring carbon in bones or a piece of wood provides an accurate date, but only within a limited range. These methods — some of which are still used today — provide only an approximate spot within a previously established sequence: Although the half-life of some of them are more consistent with the evolutionary worldview of millions to billions of years, the assumptions used in radiometric dating put the results of all radiometric dating methods in doubt.
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