At the bottom of a cliff on the Isle of Portland Richard Cooper and his father have found the fossilised skeleton of a Plesiosaur. At the time of this film, they had gathered over one hundred pieces from the limestone rocks on the beach. The fossil is a sea lizard or sea monster of the Order Enaliasaurian which includes the Jurassic ichthyosaurs. Plesiosaurs first appeared in the latest Triassic Period about two hundred and three million years ago.