Hachuring, a cartographic technique using short radiating lines to suggest a depression or slope in the terrain, can indicate anything from an ancient earthwork to a collapsed structure, and on older maps it has drawn many an investigator toward something that turns out to be considerably more prosaic. When the site was visited in 1983, that speculation was quietly resolved: the feature was a disused gravel pit, dug sometime after 1700, and of no particular antiquity. It is, in other words, a hole in the ground that was once useful, then forgotten, and eventually immortalised on a map in a way that made it look more mysterious than it ever was.