Comments from Robert Horne. I attach a photo from the quarry identified by an American researcher / Professor by chemical analysis as the one from which the Parthanon frieze marbles were mined (from 447 to 438 BCE). He told me to look for the ancient tool marks and I think they are present in my photo (like the crossed lines).
This photograph was uploaded August 31st 2011 by carnkie.Copyright / re-use statement: Photo courtesy Robert Horne http://www.rjhorne.com/index.html
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