The first dinosaur bone ever discovered in Antarctica has been identified, having spent 40 years lying unexamined in a drawer at the British Antarctic Survey (BAS) in Cambridge. The fossil, a tail bone from a Titanosaur, offers crucial insights into the ancient ecosystems of the remote continent.
Originally unearthed on James Ross Island in 1985, the specimen was logged by geologist Dr. Mike Thomson as a "vertebra of large reptile" in his field notebook. However, the team at the time was unsure of its exact nature, leading to its storage within the BAS geology collection. Dr. Mark Evans, the collections manager at BAS, recently rediscovered the fossil among thousands of other specimens, immediately suspecting its dinosaur origins due to its distinctive shape.
To confirm his suspicions, Dr. Evans enlisted the expertise of Professor Paul Barrett from the Natural History Museum (NHM). Professor Barrett quickly identified the vertebra as belonging to a Titanosaur, a group known for containing some of the largest dinosaurs to have ever existed. He highlighted specific features, such as a hollow on one end and a rounded bump on the other, which are unique to Titanosaur vertebrae, forming characteristic ball-and-socket joints along the spine.
Based on the size of the tail bone, scientists estimate this Antarctic Titanosaur would have measured approximately 7 metres in length. Professor Barrett suggested it could have been a juvenile or a smaller adult within the species, which typically grew much larger. This plant-eating dinosaur would have roamed Antarctica approximately 82 million years ago during the Late Cretaceous Period, a time when the continent was covered in lush forests, a stark contrast to its present-day icy landscape.
The findings, which have been published in the peer-reviewed journal Acta Palaeontologica Polonica, underscore the challenges and potential rewards of palaeontological research in Antarctica. While other dinosaur fossils have been found on the continent since 1985, their scarcity makes each discovery particularly significant. This forgotten fossil now holds an important place in the history of Antarctic exploration, helping researchers understand how these enormous creatures thrived in an environment vastly different from today.