Fossil found in ‘unique corner’ of Utah may explain how ancient reptiles evolved

The fossil is potentially the oldest mosasaur ever found in North America.

(Andrey Atuchin | Bureau of Land Management) An artist’s depiction of the Sarabosaurus dahli, a species of mosasaur, swimming with ammonites and fish in southern Utah, 94 million years ago.

Fossil found in ‘unique corner’ of Utah may explain how ancient reptiles evolved

The fossil is potentially the oldest mosasaur ever found in North America.

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