A “Cretaceous lizard” from the Late Cretaceous age of the Green Sand deposits in Burlington County, New Jersey. First named by Joseph Leidy in 1851, its genus was redefined in 1889 by British paleontologist Richard Lydekker who assigned many species of Late Jurassic and Cretaceous plesiosaurs from around the world to Cimoliasaurus (which he respelled Cimoliosaurus).