For decades, archaeologists have puzzled over the origins of large circular monuments in Britain. Stonehenge, with its imposing megaliths, has long been seen as the defining symbol of this ancient architectural revolution. But new research1 suggests that an earlier, lesser-known site—Flagstones, a Neolithic enclosure in Dorset—may have played a pivotal role in shaping these traditions. The revised dating of Flagstones places its construction several centuries earlier than previously thought, raising fresh questions about the evolution of ceremonial and funerary practices in Britain.
An Unexpected Discovery
In the mid-1980s, construction workers near Dorchester uncovered an ancient circular enclosure. The site, dubbed Flagstones, consisted of a segmented ring of pits, possibly once flanked by banks, enclosing a space used for burials and rituals. It bore striking similarities to early Stonehenge, leading archaeologists to assume it was from roughly the same period, around 2900 BCE.
However, a recent study led by Susan Greaney and published in Antiquity has dramatically altered this timeline. Using advanced radiocarbon dating and Bayesian statistical modeling, the research team has determined that Flagstones was built around 3200 BCE—making it at least 200 years older than Stonehenge’s first phase.
A Monument in Transition
One of the most intriguing aspects of Flagstones is its hybrid nature. In some ways, it resembles earlier Neolithic enclosures known as causewayed camps, which were typically elongated rather than circular. In others, it prefigures the later henges and stone circles that would become widespread across Britain. This transitional quality suggests that Flagstones may have been a prototype—a missing link in the evolution of ceremonial architecture.
Dr. Greaney notes that Flagstones…
“…occupies an intriguing middle ground between the older, linear monuments of the Early Neolithic and the grand circular structures that followed.”
This raises a fascinating question: Could Flagstones have inspired the architects of Stonehenge?
Rethinking Britain’s First Circles
The study situates Flagstones within a broader network of early ceremonial sites, including similar enclosures at Llandygái in Wales and Stonehenge’s earliest phase. By refining the chronology of these sites, researchers are beginning to see how these structures evolved not in isolation, but as part of a shifting landscape of ritual and memory.
One of the most striking revelations of the study is the site's funerary function. The excavations uncovered the cremated remains of adults, as well as the inhumations of children, buried beneath large slabs of sandstone. This pattern of burial bears strong similarities to practices at Stonehenge, where cremated remains were interred in its earliest phase. The researchers suggest that the presence of these burials at Flagstones might indicate a new way of honoring the dead, one that would later become a defining feature of henge monuments.
The Changing Face of Prehistoric Britain
The new dating of Flagstones challenges long-held assumptions about how and when Britain’s ancient landscapes were shaped. It suggests that the shift toward large circular monuments began earlier than expected and was more widespread than previously thought.
There is also the tantalizing possibility that Flagstones represents not just a predecessor to Stonehenge but a completely separate regional tradition. While the famous Wiltshire monument would later draw people from across Britain and beyond, sites like Flagstones may have served as more localized centers of ritual and remembrance.
A Legacy Set in Stone
What makes Flagstones so compelling is not just its age, but what it represents—a crucial chapter in the long and complex story of Britain’s Neolithic builders. By pushing back the timeline of circular monument construction, this research forces us to reconsider the creative and cultural forces at play in prehistoric Britain.
Did the people who built Flagstones conceive of it as a forerunner to the great henges that would come later? Or was it part of an older, parallel tradition that has largely been lost to time?
Whatever the answer, one thing is clear: long before Stonehenge’s towering trilithons were raised, Neolithic communities in Britain were already reimagining the landscape—one circle at a time.
Greaney, S., Hajdas, I., Dee, M., & Marshall, P. (2025). Beginning of the circle? Revised chronologies for Flagstones and Alington Avenue, Dorchester, Dorset. Antiquity, 1–17. https://doi.org/10.15184/aqy.2025.28
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