Dictionary of Human Evolution and Biology

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Absolute Geological Time

Scale established by geophysicists that is defined by time in years ago, thousands of years ago (kya), and millions of years ago (mya); the time scale is derived by using absolute dating techniques that depend upon the regular decay of unstable elements into stable daughter products. The absolute geological time scale of the earth currently extends back over 4.5 billion years (by) of earth history. Aka the geological time scale.

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