Using the principle of faunal succession, if an unidentified fossil is found in the same rock layer as an index fossil, the two species must have existed during the same period of time Figure 4.
All radiometric dating methods measure isotopes in some way.
The rate of decay of these elements helps determine their age, and in turn the age of the rocks.
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Description: One way that helps scientists place fossils into the correct era on the geologic time scale is by using radiometric dating. A fracture in a rock along which movement occurs geomagnetic polarity time scale: