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Some fossils, called index fossils, are particularly useful in correlating rocks.
For a fossil to be a good index fossil, it needs to have lived during one specific time period, be easy to identify and have been abundant and found in many places.
Have you ever wondered how scientists know so much about the earth's past?
For example, how they know Hadrosaurs, a group of duck-billed dinosaurs, lived in Alaska 90 million years ago?
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