Looking at the second aerial photograph I can see the two rings quite clearly. The line - that is described in fitcoraldo's fieldnotes as a possible field boundary - shows very clearly too, though something tangental to a circle is perhaps better described as a row, but at the top left of the picture, also on a tangent, is a third cicle, much larger than the first two, and half in frame and half out of frame of the picture. Another very long sentence. Interesting site but. If it is very remote it stands a chance of being moderately undisturbed.