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British researchers have unearthed some 200 dinosaur footprints dating back 166 million years in a find believed to be biggest in the United Kingdom.

Teams from Oxford and Birmingham Universities made the “exhilarating” discovery at a quarry in Oxfordshire in central England after a worker came across “unusual bumps” as he was stripping clay back with a mechanical digger.

Specialists believe the criss-cross tracks on the limestone floor were created by the long-necked sauropod Cetiosaurus and the meat-eating Megalosaurus, with the longest trackways reaching 150m in length.

(📸: BBC & University of Oxford & University of Birmingham)