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Techniques used for dating fossils

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Radiometric dating, often called radioactive dating, is a technique used to determine the age of materials such as rocks. It is based on a comparison between the observed abundance of a naturally occurring radioactive isotope and its decay products, using known decay rates. 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. By establishing geological timescales, radiometric dating provides a significant source of information about the ages of fossils and rates of evolutionary change, and it is also used to date archaeological materials, including ancient artifacts. The different methods of radiometric dating are accurate over different timescales, and they are useful for different materials.
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Methods of dating fossils and artifacts

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Which techniques are used to determine the age of fossils? | Yahoo Answers

Dating , in geology , determining a chronology or calendar of events in the history of Earth , using to a large degree the evidence of organic evolution in the sedimentary rocks accumulated through geologic time in marine and continental environments. To date past events, processes, formations, and fossil organisms, geologists employ a variety of techniques. These include some that establish a relative chronology in which occurrences can be placed in the correct sequence relative to one another or to some known succession of events. Radiometric dating and certain other approaches are used to provide absolute chronologies in terms of years before the present. The two approaches are often complementary, as when a sequence of occurrences in one context can be correlated with an absolute chronlogy elsewhere.
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DK Science: Dating Fossils

The fossils of the Burgess Shale , like the Burgess Shale itself, formed around million years ago in the Mid Cambrian period. After a period of neglect from the s to the early s, new excavations and re-examinations of Walcott's collection continue to discover new species, and statistical analysis suggests discoveries will continue for the foreseeable future. Stephen Jay Gould 's book Wonderful Life describes the history of discovery up to the early s, although his analysis of the implications for evolution has been contested. The fossil beds are in a series of shale layers, averaging 30 millimetres 1. These layers were deposited against the face of a high undersea limestone cliff.
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The National Park System contains a magnificent record of geologic time because rocks from each period of the geologic time scale are preserved in park landscapes. No single park has rocks from every geologic period, though some come close. With the help of clocks, calendars, and appointment books, we organize our lives around time. We divide time into years, months, weeks, and days. Geologists used fundamental concepts to understand the chronological order of rocks around the world.
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