Why cant carbon dating be used for prehistoric fossils

The good dates are confirmed using at least two different methods, ideally involving multiple independent labs for each method to cross-check results. Sometimes only one method is possible, reducing the confidence researchers have in the results. Kidding aside, dating a find is crucial for understanding its significance and relation to other fossils or artifacts. Methods fall into one of two categories: Before more precise absolute dating tools were possible, researchers used a variety of comparative approaches called relative dating. These methods — some of which are still used today — provide only an approximate spot within a previously established sequence:
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Accuracy of Fossils and Dating Methods

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Everything Worth Knowing About Scientific Dating Methods | beverlysqualitycleaners.com

Left and right, archaeologists are radiocarbon dating objects: They do it by comparing the ratio of an unstable isotope, carbon, to the normal, stable carbon All living things have about the same level of carbon, but when they die it begins to decay at uniform rate—the half-life is about 5, years, and you can use this knowledge to date objects back about 60, years. However, radiocarbon dating is hardly the only method that creative archaeologists and paleontologists have at their disposal for estimating ages and sorting out the past. Some are plainly obvious, like the clockwork rings of many old trees. But there are plenty of strange and expected ways to learn about the past form the clues it left behind. It's wasn't so long ago that megafauna ruled the American continent.
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All about Fossils and Carbon Dating: Dinosaur Teeth and More for Kids

July 10, Geologists do not use carbon-based radiometric dating to determine the age of rocks. Carbon dating only works for objects that are younger than about 50, years, and most rocks of interest are older than that. Carbon dating is used by archeologists to date trees, plants, and animal remains; as well as human artifacts made from wood and leather; because these items are generally younger than 50, years.
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Radioisotopes are atoms which have an unstable nucleus, meaning they will undergo radioactive decay. The term radioisotope comes from "radioactive isotope". An isotope is an atom which has the same number of protons, but a different number of neutrons. For example, cobalt, with 27 protons and 32 neutrons, and cobalt, with 27 protons and 33 neutrons. Isotopes will chemically interact identically, but they have different physical properties.
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