Dinosaur fossil footprints. Palaeontologists led by Pierre Hantzpergue (CNRS/Claude Bernard University Lyon 1) taking a cast of a fossil footprint left by a theropod dinosaur from the Late Jurassic (145 to 160 million years ago). These tracks form the Dinoplagne site in Plagne, in the Ain department of France. This is the longest set of dinosaur fossil tracks in the world, extending for 155 metres. The name Odysseus was given to the sauropod dinosaur leaving most of the tracks. The name Marcel was given to a theropod dinosaur that left this single footprint crossing the sauropod track. The tracks were discovered in April 2009. Photographed in July 2011.