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I sometimes wonder when a site becomes too ruinious to mention - on some maps they show sites which are so ruinious to be barely visible, sometimes they list them so ("rems of"....) and other times they just disappear.

When I visited Glenquickan in 2004, the 1970s map I was using showed a second circle within walking distance, which we tried in vain to find but failed. Then later that day, I looked at the most recent edition of the Landranger map and the circle was no longer marked.

On some of the older pre explorer OS maps there were some alarming omissions , particularly in the hillier areas of NW Scotland .Contours could be dangerously out , cliff faces could look like gentle meadows Ok if approaching from below but not so good in mist when descending .

...and some were wrongly recognised. On the older maps of Bodmin Moor there is a fougo mentioned just to the east of Brown Willy. later it was discovered it was no such thing and the map is now empty in that area apart froma few contours.

Mr H