Anthony Clarke noted that the Altar Stone's origins were surprising, as "the striking similarity to Orcadian Basin sedimentary rocks... was over 450 miles away from Stonehenge." This finding challenges previous notions of the stone's locality.
Clarke explains, "When you take this profile—a fingerprint of the rock—we can forensically compare it to potential source areas all over the U.K.," revealing the complexity of Stonehenge's geological connections.
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