Whilst on the subject...I recently picked up a book in my local charity shop called "Dartmoor's Mysterious Megaliths" bu Brian Byng. It contains a section on Merrivale, lots about diagrams about sun and moon settings and rises and many black and white drawings of dartmoor sites.
One such is Yellowmead Fourfold Circle. I see Goffic has recently visited, is it the site marked on the OS map as Cairn Circles? If so I think a visit is in order. I know the area quite well having done a bit of climbing on Sharptor when I was of lighter frame! Time to revisit.
What other sites in the Sheepstor, Burrator area should I visit? so many marked on the map.