An unprecedented paleontological discovery has taken place in the Antarctica, where a dinosaur fossil remained hidden for 40 years in a scientific collection. This finding is significant not only for being the first of its kind on the icy continent, where access to fossils is limited due to the thick ice layer, but also for belonging to one of the largest animals that ever walked the Earth.
The remarkable discovery of the first Antarctic dinosaur
The fossil was initially unearthed in 1985 during a scientific expedition, but at that time it was not possible to identify which species it belonged to. Therefore, it was stored at the British Antarctic Survey (BAS) in Cambridge, where it remained without a thorough analysis until now. A new study determined that the bone is a vertebra from the tail of a titanosaur, a group of sauropod dinosaurs known for their colossal size and herbivorous diet.
Originating from the Santa Marta Formation, this fossil dates back to the Late Cretaceous, approximately 82 million years old. Currently, it is the only dinosaur fossil from that period found in the rock layers of Antarctica.
Professor Paul Barrett from the Natural History Museum in London emphasized the scientific importance of this fossil, indicating that although the bone is small, its value lies in being the first dinosaur fossil found on the Antarctic continent.
During the time this titanosaur lived, Antarctica was very different from the desolate landscape it is today. According to Barrett, it was covered by lush temperate forests, providing a suitable environment for large herbivores.
The position of Antarctica in the supercontinent Gondwana and its warm climate, similar to other regions further from the South Pole, were due to the intense volcanic activity of the time, which released large amounts of CO2, warming the environment. This change in the current climate, with the progressive melting of Antarctica, could open new opportunities to discover more fossils revealing the continent’s rich past biodiversity.
The fossil was originally discovered by Dr. Mike Thomson during a geological exploration in search of invertebrates. However, the team thought the bone might belong to a marine reptile. The paleontologist Dr. Mark Evans from BAS, after recently reviewing it, confirmed it is a dinosaur, emphasizing the significance of the finding after four decades.
Although the largest titanosaurs reached up to 36 meters and weighed about 57 tons, the Antarctic specimen was smaller, possibly a juvenile or dwarf species, with estimates of six to seven meters in length.
This discovery provides valuable information about the distribution of dinosaurs in the southern hemisphere. To date, no titanosaurs have been found in Australia and there is scant evidence in New Zealand, supporting the hypothesis that these animals moved across connected landmasses.
Researcher Matthew Lamanna from the Carnegie Museum of Natural History highlighted how this fossil remained in a collection for decades until a new analysis identified it as a rare proof that long-necked sauropod dinosaurs inhabited Antarctica. This fact underscores the importance of museum collections, which preserve objects for future discoveries through modern techniques.
