A rare Antarctic dinosaur fossil collected more than 40 years ago has finally been identified after decades of being unnoticed in a museum collection.
Researchers identified the fossil as part of the tail of a titanosaur, a long-necked plant-eating dinosaur that lived during the Late Cretaceous Period. Although the fossil confirms the presence of the giant group in Antarctica, scientists have not yet identified the exact species. The study was published Monday in the journal Acta Palaeontologica Polonica.
A forgotten fossil reveals its identity
The fossil was discovered in 1985 by geologist Mike Thomson during an expedition to James Ross Island. Thomson, who worked with the British Antarctic Survey, was mapping the island’s rock formations and collecting marine reptile fossils to help date the surrounding sediments. He recorded the bone as belonging to a large reptile, and it was later placed in the survey’s collections.
The specimen remained there for decades before paleontologist Mark Evans noticed it while examining stored fossils. Its unusual shape suggested it could belong to a dinosaur rather than a marine reptile. Researchers then compared the bone with better-preserved dinosaur fossils from around the world. The analysis showed it belonged to the tail of a titanosaur.
Antarctica once supported giant dinosaurs
The discovery highlights how rare dinosaur fossils remain in Antarctica. Today, nearly the entire continent is buried beneath thick ice, making fossil hunting extremely difficult. During the Late Cretaceous, however, Antarctica looked very different.
The climate was much warmer, and forests covered much of the landscape. Those conditions supported a wide range of animals, including large plant-eating dinosaurs.
Researchers say the find is particularly significant because sauropod fossils from Antarctica are exceptionally rare. According to the study, it represents only the second known body fossil from a sauropod discovered on the continent. It also holds another distinction. Although its true identity was recognized only recently, it was the first dinosaur bone ever collected in Antarctica.
A small titanosaur with a remarkable story
Based on the size of the tail bone, researchers estimate the animal measured about 23 feet (7 meters) long. That made it relatively small compared with other titanosaurs, leading scientists to believe it may not have reached full adulthood. They do not know how the dinosaur died. However, they think its body drifted offshore before sinking to the seabed, where it became buried in marine sediments and eventually fossilized.
Titanosaurs were among the most successful groups of dinosaurs. More than 100 species have been identified worldwide. They walked on four legs and used their long necks to feed on tall vegetation, while their powerful tails helped balance their massive bodies. The largest members of the group exceeded 115 feet (35 meters) in length and weighed about 60 tons.
New technology uncovers an old discovery
Researchers say modern imaging technology is also helping unlock new details from fossils collected decades ago. Advanced scanning methods allow scientists to examine the internal structure of bones without damaging them, revealing features that earlier researchers could not study.
Thomson died in 2020 before scientists recognized the fossil’s true importance. His discovery, overlooked for decades, has now become one of Antarctica’s most significant dinosaur finds and offers another glimpse into a time when the frozen continent supported thriving prehistoric forests and giant dinosaurs.
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