Beneath the vast, frozen expanse of Antarctica, researchers have discovered a sprawling, ancient landscape that has remained hidden for over 34 million years. Using advanced satellite data and ice-penetrating radar, scientists revealed a forgotten world shaped by rivers and potentially covered in forests long before ice sheets encased the continent. This incredible finding in East Antarctica provides a unique window into Earth’s deep past and could offer clues about how the region might respond to future climate change.
Contents
- What was found: A massive river-carved landscape covering over 12,000 square miles.
- Where: Deep beneath the ice in Wilkes Land, East Antarctica.
- How old: Hidden for more than 34 million years.
- Why it matters: Preserves a unique record of Antarctica’s past climate and helps predict future ice sheet behavior.
Peering Beneath the Ice Sheet
Imagine using an X-ray machine powerful enough to see through a mile of ice. That’s essentially what scientists from Durham University and other institutions did, employing satellite measurements and ice-penetrating radar technology. Their scans revealed detailed features of the land surface buried deep below.
What they found wasn’t flat ground scraped smooth by ice, but a dramatic terrain featuring towering ridges up to 105 miles long and deep valleys plunging nearly 3,900 feet. This ancient landscape, stretching over 12,000 square miles, looked remarkably like one shaped by flowing rivers before a massive ice sheet formed. Stewart Jamieson, the lead author, described the discovery as “uncovering a time capsule.”
Sunlight shines over snowy mountains and icy waters in Antarctica, hinting at the continent's vast, hidden landscapes.
Preserved, Not Erased
One of the most astonishing aspects of this discovery is why this landscape is so well-preserved. Unlike many glaciers that act like giant bulldozers, grinding away the ground beneath them, the East Antarctic ice sheet in this region is “cold-based.” This means the ice remains frozen to the bedrock below, causing minimal erosion.
Because the ice here moves incredibly slowly – less than 16 feet per year – it has acted like a protective blanket, shielding the ancient river valleys and ridges from the destructive forces seen elsewhere. Professor Jamieson noted, “What we find is an ancient land surface that has not been eroded by the ice sheet, and instead it looks like it was created by rivers before the ice came along.”
A sweeping view of Antarctica's ice-covered terrain, where scientists used radar to map a hidden ancient world below.
Antarctica’s Dramatic Transformation
To understand how a river-carved landscape ended up under miles of ice, we need to look back tens of millions of years. Around 180 million years ago, Antarctica was part of the supercontinent Gondwana, much warmer and located further north. As Gondwana broke apart, Antarctica began its slow drift towards the South Pole.
This movement eventually led to the formation of the powerful Antarctic Circumpolar Current, a vast ocean current that flows clockwise around the continent. This current effectively isolated Antarctica from warmer waters, triggering a dramatic and long-term cooling trend that led to the formation of the colossal ice sheets we see today, starting over 34 million years ago. This newly discovered buried landscape dates back to a time just before, or during the very early stages of, this glaciation.
Even during later, warmer periods in Earth’s history, like the mid-Pliocene around 3 million years ago, this specific hidden region remained frozen solid beneath the accumulating ice, further protecting its ancient features.
A Glimpse into the Future?
Professor Neil Ross, a co-author of the study, highlighted the significance: “It is remarkable that this landscape, hidden in plain sight for many years, can tell us so much about the early and long-term history of the East Antarctic ice sheet.”
This discovery is more than just a fascinating look into the distant past. By understanding how the ancient landscape influenced the formation and stability of the ice sheet over millions of years, scientists can improve their models of how the East Antarctic ice sheet might behave in the face of future climate change. This includes predicting how ice might flow or melt, which has critical implications for global sea levels.
The hidden world beneath the ice serves as a vital record, helping scientists piece together the complex history of Earth’s climate and giving us better tools to anticipate the future of this crucial polar region.
