A scientist examining an ancient fossil unearthed in Antarctica made a surprising discovery during a research expedition.
They didn’t just find a dinosaur but raised questions about which continents in the Southern Hemisphere were previously connected through land.
A tiny bone fragment recovered several decades ago sat for years before being properly analyzed. It was initially believed to belong to a marine reptile.
Later, it was determined that the sample actually belonged to a land-dwelling dinosaur.
What is this supposed “lost continent,” and where can you locate it?
Antarctica’s geologic history and ancient connections
Millions of years ago, Antarctica was believed to be isolated and alone from other continents. Today, it lies beneath thick layers of ice and is surrounded by oceans that separate it from the rest.
Despite these conditions today, the Earth’s geologic history indicates that this isolation was not always the case.
In fact, at times in the distant past, Antarctica has been part of a larger land mass.
During those time periods, it supported forestland and living organisms.
There were massive dinosaurs living there during that time frame when the climate was warmer.
At the same time, South America and Antarctica were further connected through land masses.
Geologists have hypothesized for many years that the Andes mountain range does not terminate in South America. Rather than ending there, it extends out under the ocean.
As soon as it reaches the edge, it goes underneath the ocean floor.
This submerged portion of the Andes mountain range makes up a significant part of the Scotia Arc.
It includes submerged mountain ridges and volcanic island chains between the continents.
After passing over the ocean floor, this same mountain structure rises again along the Antarctic Peninsula.
Shifting perspectives on continental landscapes
The discovery of this dinosaur fossil provides another component of evidence to support this notion.
A vertebra found on James Ross Island was identified as belonging to a titanosaur. Titans were some of the biggest land animals ever to live.
Finding one in Antarctica illustrates that large land-dwelling animals existed there at one time.
You can explore the fascinating evolution and classification of these giants through the archives at the Natural History Museum of London.
This fossil was discovered in the 1980s and was not correctly identified until recently. It reinforces our knowledge of how land masses connect, allowing species to migrate between them.
In addition to this evidence, the geological structure shows that South America and Antarctica shared land.
The continued existence of this structural connection can be traced from there under the ocean.
It then rises again along the Antarctic Peninsula.
This demonstrates that these two continents were formerly physically linked.
Unearthing the evidence of a lost land bridge
Thus, the “lost continent” is not some unknown or hidden area of land awaiting discovery.
It refers to the Antarctandes, a continuation of the Andes mountain range into Antarctica.
This forms a continuous geological connection rather than a separate landmass. It begins in South America, extends under the ocean, and then re-emerges along the peninsula.
Linking species across ancient terrains
This represents what remains of the original land bridge connecting the two continents when both were part of a common supercontinent. It began with the study of a fossil.
It led to a greater understanding of how continents that are currently separate were originally connected.
Evidence supporting the past connection between the South American and Antarctic continents comes from both fossils and structural evidence within Earth’s crust.
It shows how hidden links between continents continue to shape our understanding of the past.