I met a lovely sheep-farmer up here called Jim (I was hiding in the bushes, I think he must have thought I was a sheep-worrier). Nice guy he said that they were known locally as the Pipers Stones. The cup-marks he said were the feet of cuchalainns hound that jumped from here to the Bog of Allen to the north. A serious jump by anyones standards. He mentioned hooves so maybe it was cuchalainns steed rather than hound, I think that has a better ring to it.