It isn't the first stone circle to be discovered for a hundred years - that was at Kirkhaugh and is shown on the cheating KeysToThe Past website as Holymire Circle. There's another ruined circle, quite similar to the Dartmoor example, at Longpothead, three or four miles from Kirkhaugh, and at the top of the fell. Nobody from this board has yet visited the Holymire Circle, though one character claimed to, and the landscape specialist, from TimeTeam, did a research study on the Roman fort, Epiacum, which is nearby.
Well it has even made the news in the Guardian, considering it was initially found in 2007. Guardian article sets out to confuse people though, with photo of another circle at the top, but does give 'the sacred arc' of 7 stones circles map...join the dots.
Very interesting stuff. It does beggar belief how this hasn't been 'discovered' before. If the photo is anything to go by it's hard to understand how no-one came across it in peoples' general wanderings. How do they know it would've been seen for miles around in the years of its use? It could be a recumbent stone circle, as that is what its first appears.
Obviously I am just highlighting the article as it was published. However, it does state that it was initially discovered in 2007 and that the stones were thought to have originally been up right because of the packing stones around their bases. That seem plausible IMHO but I am no archaeologist. The fact that it is now being investigated is good news.
Maybe I will get around to visiting the moor again this year and look out for this one :)