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    • Fossil ammonite from the Mesozoic era.
    Rights: The University of Waikato Te Whare Wānanga o Waikato Published 11 May 2011 Size: 340 KB Referencing Hub media

    Fossil ammonite from the Mesozoic era. Ammonites, which became extinct at the end of the Cretaceous period, are one of the fossil groups geologists use to help date rocks.

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      Dating the past – introduction

      “How old is it?” is one of the first questions you’ll probably ask when you see an interesting rock or fossil. It’s certainly one of the first things that a geologist wants to know. As you’ll ...

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