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    • Micrograph images of Two fossil dinoflagellates in a rock
    Rights: GNS Science Published 11 May 2011 Size: 110 KB Referencing Hub media

    The presence of these two fossil dinoflagellates in a rock can help date it to the late Cretaceous. The fossils are only about 200µm long.

    Micrograph by Poul Schioler.

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