Prehistoric Life Prehistoric Secrets in Stone The Earliest Fossils The Silurian Reef Trilobites Fish The Coal Forests Early Reptiles and Amphibians Sea Reptiles Flying Reptiles The Teeming Seas Hunting Dinosaurs Biggest Dinosaurs Two-Footed Plant Eaters Plated and Armoured Dinosaurs Horned Dinosaurs The Mammal Age Dawns Grassland Mammals The Ice Age	Mosasaurus The first fossil of a giant reptile ever to be discovered was the jawbone of Mosasaurus, in the Netherlands in 1770.   Previous: Back Book: Prehistoric Life Section: Prehistoric Chapter: Sea Reptiles