Plesiosaur Jaw From The Upper Cretaceous Moreno Formation, California

A skull from a plesiosaur (extinct aquatic reptile), collected in 1937 by professional paleontologists from an upper Cretaceous section of the upper Cretaceous to Paleocene Moreno Formation, as exposed near the western edge of California's Great Central Valley. Scientific name is Hydrotherosaurus welles. Photograph courtesy a specific web site.

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