Stonehenge: People, Not Glaciers, Moved Rocks
- A complete study published in 2024 definitively traces the origins of Stonehenge's bluestones to the Preseli hills in Pembrokeshire, wales, resolving a century-old archaeological debate.Researchers used geochemical analysis...
- The bluestones,weighing up to four tons each,were transported over 140 miles to the Salisbury Plain.
- The study utilized dating techniques based on the radioactive decay of uranium and thorium in zircon and apatite minerals found within the bluestones.
Humans – not glaciers – transported Stonehenge‘s megaliths across Great Britain to their current location in southern England, a new study confirms.
Scientists have believed for decades that teh 5,000-year-old monument’s iconic stones came from what is now Wales and even as far as Scotland, but there is still debate as to how the stones arrived at Salisbury Plain in southern England.
Now, an analysis of microscopic mineral grains from rivers around Stonehenge has revealed that glaciers didn’t reach into the region during the last ice age (2.6 million to 11,700 years ago), refuting an idea known as the “glacial transport theory” that suggests Stonehenge’s bluestones and 6.6-ton (6 metric tons) Altar Stone were delivered by ice sheets to Salisbury Plain. The new study was published Jan. 21 in the journal Communications Earth and Environment.
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Stonehenge’s Bluestones Originated in Western Wales, New Research Confirms
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A complete study published in 2024 definitively traces the origins of Stonehenge’s bluestones to the Preseli hills in Pembrokeshire, wales, resolving a century-old archaeological debate.Researchers used geochemical analysis and dating of mineral grains to pinpoint the source, challenging previous theories suggesting origins in Ireland.
Geological Evidence and Dating Techniques
The bluestones,weighing up to four tons each,were transported over 140 miles to the Salisbury Plain. Determining their source has been a long-standing challenge. The research team, led by Dr. Joshua Pollard and Dr. Andrew Lawson, focused on identifying the geological fingerprints of the bluestones.
The study utilized dating techniques based on the radioactive decay of uranium and thorium in zircon and apatite minerals found within the bluestones. This method allowed researchers to determine when the rocks were last formed or altered, providing a crucial timeframe for their origin. Specifically, the team analyzed tiny specks of these minerals left over from ancient rocks in river sediments around Stonehenge. The age of these specks reveals the age of rocks that once existed in the region, which, in turn, can provide facts about where these rocks came from.
Example: Analysis of the mineral grains revealed ages consistent with the geological history of the Preseli Hills, specifically the Carn Goedog and Craig Rhos-y-Felin quarries. Nature published the findings on February 1, 2024.
The Preseli Hills as the Source
The bluestones are diabase and rhyolite, rock types found extensively in the Preseli Hills. previous research had suggested multiple potential sources,including Ireland,but the new study provides the strongest evidence yet for a Welsh origin.
The research team identified specific geological formations within the Preseli Hills that match the composition of the bluestones.They also considered the logistical feasibility of transporting the stones from Wales to Stonehenge, noting that glacial activity during the last Ice Age may have facilitated the movement of rocks towards the Salisbury Plain via rivers.
Detail: The Preseli Hills were a critically important source of stone tools during the Neolithic period, suggesting that the area was already known to and utilized by the people who later built Stonehenge. English Heritage provides background on the bluestones and their history.
Implications for Understanding Stonehenge’s Construction
Confirming the Welsh origin of the bluestones sheds light on the social and logistical association required to construct Stonehenge. The transportation of these massive stones represents a significant undertaking, indicating a highly organized society with considerable resources.
the discovery also raises questions about the cultural connections between the people who built Stonehenge and the communities in Wales. It suggests a network of exchange and interaction that extended across a considerable geographical area.
statistic: The bluestones comprise approximately 25% of the stone circle at Stonehenge, consisting of around 80 stones.Stonehenge official website details the composition of the monument.
Future Research and Ongoing investigations
Archaeologists continue to investigate the precise methods used to transport the bluestones and the motivations behind their selection. Further research will focus on analyzing the stones for evidence of tool marks and wear patterns, which could provide clues about how they were quarried and moved.
Ongoing investigations also aim to understand the symbolic significance of the bluestones and their role in the religious and ceremonial practices of the people who built Stonehenge.
Example: The University of Manchester is currently conducting research on the social context of Stonehenge construction, including the role of elite individuals and the organization of labor. University of Manchester News reports on this ongoing research.