An illustration of Eurypterus exploring sea floor with Dunkleosteus lurking in the background. A typical scene from the mid Ordovician to late Permian (460 to 248 million years ago).

An illustration of Eurypterus exploring sea floor with Dunkleosteus lurking in the background. A typical scene from the mid Ordovician to late Permian (460 to 248 million years ago). - 56140730

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