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That top one ain't from a drill, surely?
http://www.ancient-wisdom.co.uk/prehistoricdrilling.htm

nigelswift wrote:
That top one ain't from a drill, surely?
http://www.ancient-wisdom.co.uk/prehistoricdrilling.htm
It suggests it was Nigel. It makes sense as well. A circle of drill holes on an original flat surface then the middle removed would leave that result once tidied up wouldn't it.