The fossil was found in 1985, but since no one knew what it was, it was put in a box at the British Antarctic Survey (BAS) institute in Cambridge. There it remained until recently, when paleontologists began examining the fossil.
Now they can confirm that it is a tail vertebra from a titanosaur, a genus of the largest dinosaurs that ever walked the earth.
"As soon as I saw the fossil I knew what we were dealing with," Professor Paul Barrett at the Natural History Museum in London told the BBC.
According to Barrett, the discovery provides new clues about how dinosaurs lived in a part of the world where very few fossils have been found.
