Fossil Unearthed in 1985 Confirmed as First Dinosaur Bone from Antarctica

A tail vertebra collected during a 1985 British Antarctic Survey expedition on James Ross Island has been confirmed as the first dinosaur fossil found in Antarctica. The specimen remained in storage at the survey's Cambridge geology collection until collections manager Dr Mark Evans examined it recently and recognized its dinosaur characteristics.

Geologist Dr Mike Thomson recorded the find in his field notebook on 9 December 1985, describing it as the "vertebra of large reptile" and noting its roughly 10 cm width.

The original team suspected it came from a marine reptile. Evans contacted Prof Paul Barrett of the Natural History Museum, who identified the bone as a Titanosaur vertebra based on its distinctive ball-and-socket joint structure, with a hollow at one end and a rounded bump at the other. "Although it's not too much to look at, it actually has a really distinctive shape," Barrett said.

"As soon as I saw it, I knew what we were dealing with... " The vertebra indicates an animal roughly 7 m long that lived about 82 million years ago during the Late Cretaceous, when Antarctica supported lush forests rather than ice sheets. More than 100 Titanosaur species have been identified worldwide.

All were four-legged plant eaters with long necks and counterbalancing tails. The largest exceeded 35 m in length and weighed about 60 tonnes. Researchers estimate this individual was either a juvenile or a smaller adult species.

"It's only when you start thinking 'what's in this drawer', that sometimes you come across something and you think, 'Ah, this looks interesting'," Evans said. Only a small number of dinosaur fossils have been recovered from Antarctica since 1985 because thick ice sheets cover most of the continent's rock record.