Radiometric dating human fossils

These layers are like bookends -- they give a beginning and an end to the period of time when the sedimentary rock formed.By using radiometric dating to determine the age of igneous brackets, researchers can accurately determine the age of the sedimentary layers between them.However, to read any clock accurately we must know where the clock was set at the beginning.

Fossils, however, form in sedimentary rock -- sediment quickly covers a dinosaur's body, and the sediment and the bones gradually turn into rock.Using the basic ideas of bracketing and radiometric dating, researchers have determined the age of rock layers all over the world.This information has also helped determine the age of the Earth itself.Other techniques include analyzing amino acids and measuring changes in an object's magnetic field.Scientists have also made improvements to the standard radiometric measurements.

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