the RCAHMS seem to think they're man-made cup marks:
http://www.rcahms.gov.uk/pls/portal/newcanmore.details_gis?inumlink=41
Cheers Andy
Thanks, Andy, All this was before the generality of t'internet - hard to imagine now! At least the RCAHMS gives me a grid ref to go on, should I ever pass that way again (and risk the Bonxies of Hermaness!).
Peace
Pilgrim
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