Model of mosasaur Gnathomortis' skull and jaw fossils (IMAGE)

Utah State University

Model of mosasaur Gnathomortis' skull and jaw fossils

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A model of the mosasaur Gnathomortis' skull, top, and the jaw fossils discovered by Colorado teen Gary Thompson in 1975, below, are on display at Brigham Young University's Museum of Paleontology in Provo, Utah.

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Joshua Lively

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