A fossil that had long appeared unremarkable—and sat forgotten in a drawer for decades—has been confirmed as the first dinosaur bone ever discovered in Antarctica. The find offers rare insight into how these giant herbivores lived in one of Earth’s most extreme and fossil-poor regions.
A Chance Rediscovery
The specimen was originally collected in 1985 during a geological expedition to James Ross Island, off the Antarctic Peninsula. Geologist Mike Thomson recorded the discovery in his field notebook on December 9, sketching the small, carefully drawn fossil and noting: “Vertebra of a large reptile,” estimating its width at about 10 centimetres. At the time, the team assumed it belonged to a marine reptile and stored it in the British Antarctic Survey’s (BAS) geological collection in Cambridge—where it remained untouched for nearly 40 years.
Identification Confirmed
Recently, paleontologists re-examined the fossil and confirmed it is a tail vertebra from a titanosaur—a group of sauropod dinosaurs that included the largest land animals ever to walk the Earth. Dr. Mark Evans, head of collections at BAS, spotted the fossil while reviewing thousands of samples returned from Antarctic expeditions over recent decades. “Sometimes, when you start looking inside a drawer, you find something and think: ‘That looks interesting,’” he said.
Evans immediately recognised distinctive anatomical features—particularly the shape of the vertebra and its unique ball-and-socket joint structure—that clearly pointed to a dinosaur rather than a marine reptile. He enlisted Professor Paul Barrett, a paleontologist at the Natural History Museum in London, to verify the identification. Holding the fossil, Barrett noted: “Although it’s not especially impressive to look at, it has a truly diagnostic shape.” He pointed to a cavity on one end and a rounded protrusion on the other—the hallmark of interlocking vertebrae found throughout the spine of titanosaurs.
A Smaller Titanosaur
Though the bone itself is relatively small, scientists estimate the animal was about seven metres long. It may have been a juvenile—or possibly a smaller-bodied adult species, distinguishing it from the better-known titanosaurs, which could exceed 35 metres in length and weigh up to 60 tonnes. This makes the fossil not only historically significant as Antarctica’s first confirmed dinosaur bone, but also scientifically valuable for understanding dinosaur diversity and adaptation in polar environments during the Cretaceous period.