Relating to or denoting a geological period in the Middle Jurassic epoch, approximately 166 to 161 million years ago.
Named after the Calloway area in Oxfordshire, England, where rocks of this age are exposed. Geological periods are typically named after geographic locations where they were first identified.
The Callovian period saw the heyday of the sauropods—the biggest land animals ever—and during this time the first birds were evolving; it's a moment when dinosaurs dominated every ecological role imaginable.
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