#Stonehenge: New Discovery solves construction mystery!

New Discovery Solves One Mystery of Stonehenge’s Construction ~ Nick Romeo , National Geographic, DECEMBER 07, 2015.

New findings from a team of British archaeologists shed light on how some of Stonehenge’s monoliths were extracted and transported.  

Picture of Sunset at Stonehenge on the Salisbury Plain of Wiltshire in Southern England

 

Researchers believe they’ve found the origin of some of the stones that make up Stonehenge.

 

In an announcement Monday, the team said it found extensive evidence of Neolithic stone quarrying at two sites in Wales that supplied the distinctive ‘bluestones’ erected at Stonehenge around 5,000 years ago. Forty-three bluestones survive out of an estimated 80 that once stood at Stonehenge; they form an inner horseshoe at the site, surrounded by the outer circle of much larger giant sandstone monoliths. By dating and studying artifacts from the quarries, the archaeologists have determined when and how prehistoric people first extracted these bluestones.

The Welsh quarries are located in the Preseli hills in north Pembrokeshire, roughly 180 miles (290 km) from from Stonehenge by land. The bluestones weigh 1-2 tons and are up to 8 feet tall.

The stones are volcanic and igneous rocks with precise geological signatures that match the inner horseshoe of smaller rocks at Stonehenge. Geologists have shown that this region of Wales is the only part of the British Isles that contains a particular type of rock—spotted dolerite—common in the bluestones.

Archaeologists have uncovered stone tools, dirt ramps and platforms, burnt charcoal and chestnuts, and an ancient sunken road that was likely the exit route from the quarry. “While we knew the locations where the rocks originated, the really exciting thing was to find actual quarries,” says Mike Parker Pearson, director of the project and a professor at University College London. “They built extensive facilities here: platforms, ramps, a loading bay. You can see chisel marks where they drove in wooden wedges at the recesses on the outcrop.”

Radiocarbon dates from charcoal and burned hazelnuts at prehistoric campfires show Neolithic activity at the quarries between 5,400 and 5,200 years ago. Researchers believe that Stonehenge was not built before 5000 BC. This raises a puzzling question: where were the stones during those 400 years?

 

 

“It’s intriguing,” Parker Pearson says, “and while it could’ve taken those Neolithic stone-draggers nearly 500 years to get them to Stonehenge, that’s pretty improbable. It’s more likely that the stones were first used in a local monument somewhere near the quarries that was then dismantled and dragged off to Wiltshire.” Locating and studying the site of this possible local monument will be a primary research goal for the team in 2016.

Moving Two-Ton Monoliths

Naturally forming rock pillars at the quarry sites made things somewhat easier for the prehistoric workers. “They only had to insert wooden wedges into the cracks between the pillars and then let the Welsh rain do the rest by swelling the wood to ease each pillar off the rock face,” says Dr. Josh Pollard of the University of Southampton. “The quarry-workers then lowered the thin pillars onto platforms of earth and stone, a sort of ‘loading bay’ from where the huge stones could be dragged away along trackways leading out of each quarry.”

 

 


 

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