The world’s oldest fossilised turtle, dating back at least 120 million years, has been discovered.It is thought to be 25 million years older than the previously known oldest specimen. The almost completely preserved skeleton from the Cretaceous period measured more than six and a half feet (two metres) long and would have looked remarkably similar to a modern marine turtles.Sea turtles descended from terrestrial and freshwater turtles that arose approximately 230 million years ago. During the Cretaceous period, they split into land and sea dwellers.