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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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