Plesiosauria Plesiosauria The Plesiosauria (; Greek: πλησίος, "plesios", meaning "near to" and "sauros", meaning "lizard") or plesiosaurs are an order or clade of Mesozoic marine reptiles (marine Sauropsida), belonging to the Sauropterygia. Plesiosaurs first appeared in the latest Triassic Period, possibly in the Rhaetian stage, about 203 million years ago. They became especially common during the Jurassic Period, thriving until their disappearance due to the Cretaceous–Paleogene extinction event at the end of the Cretaceous Period, about 66 million years ago. They had a worldwide oceanic distribution. Plesiosaurs were among the first fossil reptiles discovered. In the beginning of the nineteenth century,
Dinosaurs: Giants of Patagonia Dinosaurs: Giants of Patagonia Dinosaurs: Giants of Patagonia is a 2007 film about life in the Early Cretaceous, Patagonia. It features paleontologist Rodolfo Coria and his work, with Donald Sutherland acting as main narrator. The movie opens on a scene from approximately 65 million years ago, in the Late Cretaceous. The narrator explains that a massive comet is about to arrive to mark the end of dinosaurs, before taking us back to the Late Jurassic, circa 150 million years ago. From the announced end of the dinosaurs, this time travel serves the purpose of introducing us the biggest creatures to