I passed this site totally by chance.
I just noticed it over a hedge as I approach the clapper bridge at Delford.
I took several photos with zoom lense from the road side.
Looking at the stone from different angles it looks to me like a fallen Quoit stone, other stones scattered around it would add weight to this theory.
Looking on the map I found that the neighbouring farms go by the names
Penquite, South Penquite, Best Penquite, Higher Penquite and Lower Penquite
“Pen” = Hill or Head “quite” could be a corruption of quoit
hence: Quoit on the hill
Anyone agree?
Phil