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    Dating geologic time

    As we pointed out in these two articles, radiometric dates are based on known rates of radioactivity, a phenomenon that is rooted in fundamental laws of physics and follows simple mathematical formulas.Dating schemes based on rates of radioactivity have been refined and scrutinized for several decades.In a related article on geologic ages (Ages), we presented a chart with the various geologic eras and their ages.In a separate article (Radiometric dating), we sketched in some technical detail how these dates are calculated using radiometric dating techniques.However, by itself a fossil has little meaning unless it is placed within some context.

    ** The Ediacaran is the only formal system in the Proterozoic with a global boundary stratotype section and point (GSSP). A geologic time scale is composed of standard stratigraphic divisions based on rock sequences and is calibrated in years (Harland and others, 1982). Geological Survey Geologic Names Committee, 2007, Divisions of geologic time-major chronostratigraphic and geochronologic units: U.

    Understanding the ages of related fossil species helps scientists piece together the evolutionary history of a group of organisms.

    For example, based on the primate fossil record, scientists know that living primates evolved from fossil primates and that this evolutionary history took tens of millions of years.

    The Hadean eon represents the time before fossil record of life on Earth; its upper boundary is now regarded as 4.0 Ga (billion years ago).

    Other subdivisions reflect the evolution of life; the Archean and Proterozoic are both eons, the Palaeozoic, Mesozoic and Cenozoic are eras of the Phanerozoic eon.

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