An Antarctic pyramid? It’s the kind of newsflash that could prompt a thousand conspiracy theories or at least a few spirited debates at the neighborhood geology club. The recent spate of dramatic Google Earth images, revealing a brusquely angular nunatak piercing the snowy horizon of the Ellsworth Mountains, has electrified the planet with curiosity. Social media is filled with rumor: some attribute the work of a lost civilization, others claim aliens. But beneath rumor and ice, the truth is one of the unglamorous, steady beauty of geology.
The enigmatic summit, standing at coordinates 79°58’39.25” S 81°57’32.21” W in the Heritage Range, is a testament to nature’s tremendous power. Geologists are quick to point out that, while the shape of the mountain is surprisingly close to the Great Pyramid of Giza, its origin is entirely terrestrial. University of California, Irvine, professor Eric Rignot refutes the viral hoax personally: “This is just a mountain that looks like a pyramid.” He continues, “Pyramid shapes are not impossible many peaks partially look like pyramids, but they only have one to two faces like that, rarely four.” The Antarctic “pyramid” is a nunatak a rocky summit that pierces above the cover of overlying ice sheet formed by the relentless operation of freeze-thaw weathering and erosion over hundreds of millions of years as detailed in recent geological surveys.
The process for this formation is elegantly simple but effective. With the brief Antarctic summer, daylightand somewhat warmer temperatures allow water to seep into crevices in the mountain. Through the night, when the temperature becomes cold, the water freezes, expands, and acts as a wedge, gradually opening the rock. Over millions of cycles, huge chunks shear away, leaving the angular, steep faces which so closely resemble man-made pyramids. Mauri Pelto, a professor of environmental science at Nichols College, says, “The water expands in the cracks as it freezes, causing the gaps to grow larger under the resulting pressure and eventually causing large chunks of rock to break off of the mountain.” Freeze-thaw, or cryofracturing, is one of the principal shapers of the landscape in Antarctica and elsewhere.
The Ellsworth Mountains themselves are a geological marvel. They extend over 400 kilometers in length and are Antarctica’s highest range, formed about 150 million years ago as part of the ancient supercontinent Gondwanaland. Their sedimentary and metamorphic rocks, a combination of both, reflect on the tectonic forces that once connected Antarctica to Africa, South America, and Australia through rich geological histories. The area’s harsh climate with temperatures plummeting as low as -50°C and strong katabatic winds also shape the landscape, only letting the most robust peaks, like the so-called pyramid, stand above the massive ice sheet.
Advanced technology has played a key role in unearthing these landmarks. Satellite remote sensing on ASTER and Landsat platforms enables researchers to view and chart glacial features, track changes in ice cover, and identify phenomena like pyramid-shaped nunatak with unprecedented precision. “Remote sensing has revolutionised glaciology and glacial geology by enabling quick, cheap and logistically simple ways to map large landscapes,” scientists explain, adding that satellite imagery is invaluable for distinguishing natural formations from potential artifacts in the vast, inaccessible terrain of Antarctica.
For subsurface features, ground-penetrating radar is invaluable. GPR surveys can reveal subglacial topography and the true extent of nunatak forms, demonstrating that what appears to be a single peak is the exposed tip of a much larger structure. Already, such surveys have revealed box-valley forms and sedimentary basins below the ice, teaching us more about how these mountains evolved and glacial and periglacial processes interact.
Regardless of how ongoing the interest in ancient cultures or space-based engineers, scientific consensus stands firm.Dr. Mitch Darcy ofgeologist of German Research Centre for Geosciences puts it straightforward: “By definition, it is a nunatak, which is simply a peak of rock sticking out above a glacier or an ice sheet. This one has the shape of a pyramid, but that doesn’t make it a human construction.” The resemblance to well-known pyramids is a case of pareidolia the tendency of humans to perceive random natural patterns as shapes and figures familiar to them. As global warming gradually melts Antarctic ice, more such features might emerge, generating interest and, naturally, more speculation. But each new find is an opportunity for scientific exploration, a reminder that the world’s most striking forms are due to the patient, incremental touch of nature.
