<i>Plotosaurus bennisoni</i> (IMAGE) Geological Society of America Caption Plotosaurus bennisoni is a mosasaur from the Upper Cretaceous (Maastrichtian) North America. Credit Restoration illustration from Wikimedia Commons, CC BY 3.0. Usage Restrictions Restoration illustration from Wikimedia Commons, CC BY 3.0. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.