Researchers studying the origins of Stonehenge’s mysterious Altar Stone have proposed a compelling new possibility for how the enormous rock began its remarkable journey from Scotland to southern England. A collaborative team of scientists from Sheffield Hallam University and Curtin University in Australia has analyzed ancient ice movement and determined that glaciers during Britain’s last ice age may have transported the stone from Scotland’s Orcadian Basin as far south as Dogger Bank in the North Sea. From that submerged region, however, prehistoric people would still have had to manually move the colossal monolith hundreds of kilometers across challenging terrain to its final resting place on Salisbury Plain.
Stonehenge’s central Altar Stone is an imposing six-tonne sandstone megalith that researchers have recently traced back to northeast Scotland, roughly 700 kilometers, or 435 miles, away from the iconic prehistoric monument in Wiltshire. This remarkably distant origin has long presented archaeologists and geologists with one of the ancient stone circle’s most intriguing and debated questions: how did such an enormous block of stone travel such a vast distance during a time without modern machinery, paved roads, or wheeled transport systems?
Tracing the Altar Stone From Scotland
To reconstruct the potential route and solve this geographical puzzle, researchers combined advanced mineral grain dating techniques with sophisticated computer models of ancient ice sheets. This multidisciplinary approach allowed the scientific team to investigate both where the stone originally formed and whether prehistoric glaciers could realistically have carried it southward across the British landscape.
Dr. Remy Veness, co-lead author of the research paper from Sheffield Hallam University, explained the significance of the latest findings. "We recently discovered that the origin of the Altar Stone is northeast Scotland, but how it traveled 700 km to Salisbury Plain is widely debated," Dr. Veness noted. "Our research gives a new plausible explanation for part of the journey to Salisbury Plain."
Furthermore, the implications of the study extend beyond simple logistics into the realm of ancient human culture and resource management. "What is exciting about these findings is that they could imply that the people of Doggerland attached cultural significance to the Altar Stone long before it was incorporated into Stonehenge," Dr. Veness added.
According to the researchers’ hypothesis, the Altar Stone may have held enough value to its ancient custodians that they were willing to move it at least twice. First, they may have intervened to save the stone from being permanently submerged by rising sea levels at the end of the last ice age, hauling it to safety. Later, it was moved a second time to its final, legendary resting place on the Salisbury Plain, where it became a central component of one of the world’s most famous megalithic monuments.
A Possible Stop in Lost Doggerland
To understand this multi-stage journey, researchers must look at Doggerland, a vast and fertile Neolithic landscape that once connected the east coast of Great Britain to continental Europe. Today, this ancient region lies entirely submerged beneath the cold waters of the North Sea. Because Doggerland lacked natural local rock outcrops of this type, any large stone found within its historical boundaries would have had to arrive from somewhere else, most likely transported southward by the immense power of advancing ice sheets.
The research team suggests that the Altar Stone could have been deposited directly in the Dogger Bank region by glacial activity. As the local climate warmed, the landscape transformed, and sea levels steadily rose, people living in the area may have taken charge of the monolith, moving it inland as their traditional territories shrank beneath the encroaching waves.
From this lost prehistoric landscape of Doggerland, the stone could eventually have been transported toward the Berkshire Ridgeway, a high-altitude trackway long regarded as the oldest road in Europe. Archaeological evidence confirms that this ancient route was in active use around the time Stonehenge was constructed, meaning it could have provided a vital, established overland corridor for travelers moving toward Salisbury Plain.
Glaciers Could Only Explain Part of the Journey
Despite the fascinating possibility of glacial assistance, co-lead author Dr. Anthony Clarke, from the Timescales of Minerals Systems Group within Curtin’s School of Earth and Planetary Sciences, emphasized that the physical evidence points toward a complicated journey involving multiple distinct stages rather than a single, uninterrupted natural route.
"Rather than being carried naturally by ice, the evidence points to a deliberate, carefully planned movement across a challenging and varied landscape," Dr. Clarke stated.
The computer modeling undertaken by the research team demonstrates that while glaciers may indeed have transported rocks part of the way during the last Ice Age—potentially carrying the Altar Stone as far as Dogger Bank in the North Sea—they could not have carried it into southern England. This geological limitation means the stone would still have needed to be moved hundreds of kilometers by human hands and coordinated muscle power.
"The research indicates there were no viable glacial pathways linking the source region directly to Stonehenge, reinforcing the conclusion that human transport was required," Dr. Clarke explained. "Instead, this suggests the stone was likely moved in stages, potentially combining overland hauling with river or coastal transport where possible."
A Remarkable Neolithic Transport Effort
If this newly proposed route is correct, the successful transport of the Altar Stone to Stonehenge would have demanded extraordinary levels of social cooperation, communication, and engineering skill among Neolithic communities. Moving such an exceptionally large and heavy rock through diverse landscapes over hundreds of kilometers would have required meticulous organization, abundant labor, and detailed, generational knowledge of geography and navigable routes.
Dr. Clarke noted that these findings point to a level of collective planning and community coordination that modern observers may not have fully appreciated before.
"Transporting a stone of this size over such a long distance would have required planning, coordination and a deep understanding of the landscape—not to mention tremendous determination," Dr. Clarke said. "The study demonstrates how combining geological analysis with computer modeling can help resolve long-standing questions about how Stonehenge was built."
Looking ahead, the research team hopes to narrow down the exact geographic source of the Altar Stone within northeast Scotland and investigate in much greater detail the specific land and water routes that prehistoric communities may have utilized to complete its epic southward journey.
The groundbreaking research was co-led by Sheffield Hallam University and Curtin University, working in close collaboration with specialized experts from the University of Sheffield, Wessex Archaeology, and the University of Bristol.
