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Watch this video to find out how we use index fossils to establish the relative ages of rocks.

In previous lessons, we talked about the Geologic Time Scale and how scientists use it to piece together the history of the earth.

Now, when we use fossils to date rocks, we have to be careful. Remember that some species of animals and plants lived for a very long time, while others existed only for a short period of time.

We don't want to use fossils belonging to species that lived for too long; these fossils would show up in more than one rock layer.

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