When did *Eryops* most likely vanish relative to the Permian-Triassic extinction event?
Answer
Well before the Permian-Triassic extinction (252 mya)
The text states that *Eryops* seems to have faded out toward the middle of the Permian, missing the final global cataclysm known as the Permian-Triassic extinction, which occurred roughly 252 million years ago.

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