Dewars Farm Quarry

51.919°N 1.217°W / 51.919; -1.217 Dewars Farm Quarry is a limestone quarry in Oxfordshire, England, between Ardley and Middleton Stoney in which extensive tracks of dinosaur footprints were found in 2024. The quarry excavates a layer of limestone which is crushed and graded for use as construction aggregate. The underlying layer contains the footprints, which were formed in mudflats during the Middle Jurassic.^[1][2] The tracks are similar to the nearby Ardley Trackways which were found in 1997.^[1][2]

A track found in summer 2025, 220 m (720 ft) long, has been described as "one of the longest trackways found anywhere in the world".^[3] It shows the tracks of a large sauropod dinosaur, "probably Cetiosaurus", moving at about 2 metres per second (6.6 ft/s), a speed similar to a human walking fast.^[3] Megalosaurus prints were also found. The tracks were probably all made over a period of weeks.^[3]

At the time the prints were made, the site was much closer to the equator and covered with a shallow tropical sea. The quarry floor has many tiny shells of sea creatures; an almost complete tiny sea urchin was found.^[3]

An excavation and investigation by paleontologists was featured in January 2025 in Alice Roberts' television series Digging for Britain.^[4][5]