The bone, discovered on 25 July, belongs to a saurapoda, a group of herbivorous, four-footed dinosaurs that was one of the largest creatures that ever walked the earth – reaching 40 metres in length and weighing up to 50 tonnes.
The largest saurapoda femur in the world was found at the same site in 2010.
The bone unearthed on Friday was part of a toe and still bears traces of the beast’s giant claw.
Some 4,000 pieces have been found at the Angeac-Charente site, which was discovered in 2008 and has been excavated since 2010, and seven species of dinosaur have been identified.
Vegetable and animal fossils show that 130 million years ago it was a marshy tropical zone.