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Mosasaurs were large, marine platynotan lizards which became abundant and diversified during the latter half of Cretaceous time, but disappeared at the close of the period….
Russell, Dale A.. 1967. "Systematics and morphology of American mosasaurs (Reptilia, Sauria)." Bulletin of the Peabody Museum of Natural History , (23). https://elischolar.library.yale.edu/peabody_museum_natural_history_bulletin/23