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    • Diagram: Trilobites, ammonites and belemnites as index fossils
    Rights: The University of Waikato Te Whare Wānanga o Waikato Published 11 May 2011 Size: 110 KB Referencing Hub media

    Trilobites lived at a different time to ammonites and belemnites. Finding a trilobite fossil in a rock tells you the rock was formed in the Paleozoic era.

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      Relative dating

      Relative dating is used to arrange geological events, and the rocks they leave behind, in a sequence. The method of reading the order is called stratigraphy (layers of rock are called strata) ...

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