"The mystery of where the stone came from is becoming clearer and clearer as we begin to rule out specific areas in north-east Scotland," said Professor Richard Bevins from Aberystwyth University, the lead author of the new study.
"This research is radically changing our thinking about the origins of the Altar Stone. It's thrilling to know that our chemical analysis and dating work is slowly unlocking this great mystery."
"Whilst, at six tonnes, it is nowhere near the size of the sarsens, it is substantially larger than the bluestones, with which it has previously been classed."
"Rather, experts found a remarkable similarity with the Old Red Sandstone of the Orcadian Basin in northeast Scotland, concluding with 95 percent accuracy that the stone came from this area."
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