Hi again Charles,
Do you know anything about the monument, or if there are more of that type thereabouts? It bears an uncanny likeness to a Cork/Kerry asc, is why I ask. The orientation you gave, allowing wildness of guess, would also fit.
Do you know anything about 'circles' around here (Andalusia), if you happen to read this, George? I went through my bookshelves last night and came up with nothing.