The UK's biggest ever dinosaur trackway site has been discovered in a quarry in Oxfordshire.

Another trackway site had been found nearby in the 1990s, so he realised the regular bumps and dips could be dinosaur footprints.

"The really lovely thing about a dinosaur footprint, particularly if you have a trackway, is that it is a snapshot in the life of the animal," Prof Butler explained.

The long trackway, however, was made by a single individual who left a flatter print, more like that of the Australopithecus at Laetoli.

“This trackway is particularly beautifully preserved,” says paleoanthropologist Louise Leakey of Stony Brook University and director of the Koobi Fora Research Project.