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Explain how scientists use radioactive dating to approximate a fossils age

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By: Tracy V. When paleontologist Mary Schweitzer found soft tissue in a Tyrannosaurus rex fossil , her discovery raised an obvious question -- how the tissue could have survived so long? The bone was 68 million years old, and conventional wisdom about fossilization is that all soft tissue, from blood to brains , decomposes. Only hard parts, like bones and teeth, can become fossils. But for some people, the discovery raised a different question. How do scientists know the bones are really 68 million years old?
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Radioactive atoms called isotopes will decay into different kinds of atoms at a steady and constant rate. We can measure this rate. We express this in terms of 'half-life. This means that after million years a rock that had an initial quantity of uranium and no lead will have decayed to become half uranium half lead. Uranium decays to lead with a half-life of 4.
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A number of methods are used today to date fossils. Most of the methods are indirect meaning that the age of the soil or rock in which the fossils are found are dated, not the fossils themselves. The most common way to ascertain the age of a fossil is by determining where it is found in rock layers.
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The age of fossils can be determined using stratigraphy, biostratigraphy, and radiocarbon dating. Paleontology seeks to map out how life evolved across geologic time. A substantial hurdle is the difficulty of working out fossil ages.
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